SFC /SCANNOW Command - System File Checker

How to Repair Windows 7 System Files with System File Checker​

   Information

The sfc /scannow command (System File Checker) scans the integrity of all protected Windows 7 system files and replaces incorrect corrupted, changed/modified, or damaged versions with the correct versions if possible.

   Tip

If you get the Windows Resource Protection Could Not Start the Repair Service error when trying to run SFC, then make sure that the Windows Modules Installer service is enabled, click on Start, and set to Manual.

Services - Start or Disable

OR

Copy and paste the command below in the elevated command prompt, and press Enter. After the Windows Modules Installer service has started, try running the SFC command again

net start trustedinstaller

   Note

The KB3022345, KB3035583, and KB3068708 updates will cause SFC to give you a false mismatch message in SFC for files related to these updates.

You can safely ignore these results in your SFC details since it will not affect SFC from being able to repair other system files.

   Warning

Be aware that if you have modified your system files as in theming explorer/system files, running sfc /scannow will revert the system files such as explorer.exe back to it's default state. Make the appropriate backups of your system files that you have modified for theming if you wish to save them before running sfc /scannow.

:note: For the updated Windows 10 tutorial, please see - SFC Command - Run in Windows 10 - Windows 10 Tutorials

CONTENTS:

• Option One: To Run the SFC /SCANNOW Command at Boot
• Option Two: To Run the SFC /SCANNOW Command in Windows 7
• Option Three: How to See and Read Only the "SFC" Scan Results from the CBS.LOG

OPTION ONE

To Run the SFC /SCANNOW Command at Boot

1. For how, see METHOD TWO at this link: SFC /SCANNOW : Run in Command Prompt at Boot

   Note

Using OPTION TWO below is recommended if able.

If you would like to get help with your SFC issue, then be sure to upload and attach your sfcdetails.txt file from OPTION THREE below in your post.

OPTION TWO

To Run the SFC /SCANNOW Command in Windows 7

1. Open an elevated command prompt or an elevated PowerShell, and do step 2 or 3 below for what type of scan you would like to run.


2. To Scan and Repair System Files
NOTE: Scans the integrity of all protected system files and repairs the system files if needed. Please see red WARNING box at the top of this tutorial.
A) In the elevated command prompt, type sfc /scannow, press Enter, and go to step 4 below. (see screenshot below)
NOTE: This may take a little bit to finish.


3. To Only Verify if the System Files are Corrupted
NOTE: Scans and only verifies the integrity of all proteced system files only. This command will not change your system files as in the red WARNING box at the top of this tutorial.
A) In the elevated command prompt, type sfc /verifyonly, press Enter, and go to step 4 below.
4. When the scan is complete, hopefully you will see all is ok like the screenshot below.

   Note

• If SFC could not fix something, then run the command again to see if it may be able to the next time. Sometimes it may take running the sfc /scannow command 3 or more times to completely fix everything that it's able to.
• If not, then download and run the 32-bit (x86) or 64-bit (x64) System Update Readiness Tool for your same installed 32-bit or 64-bit Windows 7, restart the PC afterwards, and try the sfc /scannow command again.
• If still not, then try using OPTION ONE above to run the sfc /scannow command at boot.
• If still not, then you can attempt to run a System Restore using a restore point dated before the bad file occured to fix it. You may need to repeat doing a System Restore until you find a older restore point that may work.
• If still not, then you can use the steps in the TIP box in the OPTION THREE section below to manually replace the files that SFC could not fix if there are not to many fix.
• If there are to many files to manually fix, or you prefer not to use OPTION THREE below, then you could do a repair install without losing anything.

If you would like to get help with your SFC issue, then be sure to upload and attach your sfcdetails.txt file from OPTION THREE below in your post.

5. When done, close the elevated command prompt.

OPTION THREE

How to See and Read Only the "SFC" Scan Results from the CBS.LOG

   Note

When SFC runs, it logs it's actions into the C:\Windows\Logs\CBS\CBS.log. The steps in this option will show you how to see only the specific SFC entries with the [SR] tags in this CBS.log. This can be helpful to show you what files SFC could not fix automatically if you wanted to try and manually replace them.

1. Open an "elevated command prompt" (right click -> Run as administrator).

2. In the elevated command prompt, copy and paste the command below, and press Enter. (See screenshot below)
NOTE: This will place a sfcdetails.txt file on your desktop with only the SFC scan result details from the CBS.LOG in it.

findstr /c:"[SR]" %windir%\Logs\CBS\CBS.log >"%userprofile%\Desktop\sfcdetails.txt"

3. Close the elevated command prompt.

4. Open the sfcdetails.txt file on your desktop to see the SFC scan details in the CBS.LOG.

5. You can safely delete the sfcdetails.txt file afterwards if you like.

   Tip

If you need to replace a corrupted system file that SFC cannot fix, then this will show you how to by extracting a new copy directly from your Windows 7 installation DVD.

Extract Files from Windows 7 Installation DVD

That's it,
Shawn

Related Tutorials

---

• How to Run the System File Checker in a Command Prompt at Boot
• How to Do a System Restore in Windows 7
• How to Do a Repair Install to Fix Windows 7
• How to Run Disk Check in Windows 7
• How to See Windows 7 Reliability and Problem History with Reliability Monitor
• How to Extract Files from the Windows 7 Installation DVD
• How to Troubleshoot a Problem by Performing a Clean Startup in Windows 7 or Vista

 

[Brink]

The mscorjit.dll is the file that is killing me. I have a few programs that require that file and every time I try and start those programs I get the "cannot find mscorjit.dll" and the program closes with no other chance to open the program. I have uninstalled and reinstalled every version of .net I could find hoping it would fix.

edit: I have been running through Aaron Stebner's blog trying to find something that sticks.
Aaron Stebner's WebLog - Site Home - MSDN Blogs

You might see if turning off, OK, restart, turn on, OK, restart the "Microsoft .NET Framework" in Windows Features may help.

http://www.sevenforums.com/tutorials/5023-windows-features-turn-off.html

 

[marsmimar]

My apologies for jumping in. I found this Microsoft forum thread that talks about fixing a missing or corrupt mscorjit.dll file. If you've already seen this / tried this my sincerest apologies.

Getting error "Unable to load Jit Compiler: (mscorjit.dll): file may be missing or corrupt" while opening RDCMan.exe

 

[conchuotduy]

@Brink: I upload *.log

Can you help me?

 

[Brink]

Hello Conchoutduy, and welcome to Seven Forums.

Looking at your log entries below, it looks like all you need to do is reinstall your printer drivers.

2013-10-19 15:53:53, Info     CSI    0000084c [SR] Cannot repair member file [l:36{18}]"Amd64\CNBJ2530.DPB" of [B]prncacla.inf[/B], Version = 6.3.9600.16384, pA = PROCESSOR_ARCHITECTURE_AMD64 (9), Culture neutral, VersionScope = 1 nonSxS, PublicKeyToken = {l:8 b:31bf3856ad364e35}, Type = [l:24{12}]"driverUpdate", TypeName neutral, PublicKey neutral in the store, hash mismatch

 2013-10-19 15:53:54, Info      CSI    0000084e [SR] Cannot repair member file [l:36{18}]"Amd64\CNBJ2530.DPB" of [B]prncacla.inf[/B], Version = 6.3.9600.16384, pA = PROCESSOR_ARCHITECTURE_AMD64 (9), Culture neutral, VersionScope = 1 nonSxS, PublicKeyToken = {l:8 b:31bf3856ad364e35}, Type = [l:24{12}]"driverUpdate", TypeName neutral, PublicKey neutral in the store, hash mismatch

 2013-10-19 15:53:54, Info     CSI    0000084f [SR] This component was referenced by [l:186{93}]"[B]Microsoft-Windows-Printer-Drivers-Package[/B]~31bf3856ad364e35~amd64~~6.3.9600.16384.INF_prncacla"

 

[conchuotduy]

Hello Conchoutduy, and welcome to Seven Forums.

Looking at your log entries below, it looks like all you need to do is reinstall your printer drivers.

2013-10-19 15:53:53, Info     CSI    0000084c [SR] Cannot repair member file [l:36{18}]"Amd64\CNBJ2530.DPB" of [B]prncacla.inf[/B], Version = 6.3.9600.16384, pA = PROCESSOR_ARCHITECTURE_AMD64 (9), Culture neutral, VersionScope = 1 nonSxS, PublicKeyToken = {l:8 b:31bf3856ad364e35}, Type = [l:24{12}]"driverUpdate", TypeName neutral, PublicKey neutral in the store, hash mismatch

 2013-10-19 15:53:54, Info      CSI    0000084e [SR] Cannot repair member file [l:36{18}]"Amd64\CNBJ2530.DPB" of [B]prncacla.inf[/B], Version = 6.3.9600.16384, pA = PROCESSOR_ARCHITECTURE_AMD64 (9), Culture neutral, VersionScope = 1 nonSxS, PublicKeyToken = {l:8 b:31bf3856ad364e35}, Type = [l:24{12}]"driverUpdate", TypeName neutral, PublicKey neutral in the store, hash mismatch

 2013-10-19 15:53:54, Info     CSI    0000084f [SR] This component was referenced by [l:186{93}]"[B]Microsoft-Windows-Printer-Drivers-Package[/B]~31bf3856ad364e35~amd64~~6.3.9600.16384.INF_prncacla"

Thank for help. I just recheck and it's work fine not err

 

[Brink]

You're welcome.

 

[Azri Bovier]

Been finding The answer

Hello...Can Someone help me?..i tried to use the sfc /scannow in the command prompt and it crashes and forces shutdown at 18%-35%.. Is it my hard disk or my system file.. Sorry to bug you.

 

[Brink]

Hello Azri, and welcome to Seven Forums.

Any error message?

Does it feel like it's overheating to cause it to shut down?

 

[Azri Bovier]

Hello Azri, and welcome to Seven Forums.

Any error message?

Does it feel like it's overheating to cause it to shut down?

No I don't feel like overheating..and im not an expert on laptops...when I switch on my laptop it prompt a start up repair and then I repair it..while it fix the start up and boom it crashes again and its very frustrating when it shutdown suddenly..aw..

 

[Azri Bovier]

Found something new..

There was an error on event log..said kernel power error..and when ever I try to chkdisk at the startup it crashes

Edit: sorry if this is unrelated to the thread discussion

 

[Brink]

There was an error on event log..said kernel power error..and when ever I try to chkdisk at the startup it crashes

Edit: sorry if this is unrelated to the thread discussion

Since this is a "kernal power error" issue, please go ahead and follow the instructions at the link below, and create a new thread in the BSOD Help and Support forum area with the needed details and information.

Blue Screen of Death (BSOD) Posting Instructions

 

[malanh]

Hi everyone.

Can someone help with the SFC error i am getting.

I have run it three times, i have even tried repairing from windows 7 disk with no luck.

it get stuck at 59% everytime

 

[Brink]

Hello Malanh, and welcome to Seven Forums.

So far in your log, SFC hasn't found any corrupted files.

You might run chkdsk on your C: (Windows) drive to see if that may allow SFC to finish afterwards.

If not, the you could give running the System Update Readiness Tool listed in the blue Note box under step 4 in Option Two.

Hope this helps for now,
Shawn

 

[malanh]

Hi Shawn,
Thanks for replying.

I ran chkdsk and it completed with no errors.

attached is a copy of a complete cbs.log

I think it may be something to do with zeroaccess.

scans don't find anything wrong, SFC seems to be the only indication something is wrong

This all started when i was trying to update antivirus, initially windows firewall and the base filtering engine wasn't running. now im stuck on the security center service not being in the services list.

Mathew

 

[Brink]

Mathew,

Sometimes SFC may take a bit to finish.

Are you or were you infected with zeroaccess? AVG Free | Win32/ZeroAccess | Removal Tool Download

It sounds like you are. I would recommend to do a full scan of your system to help make sure that your system is clean. Personally, when it comes to viruses and trojans, I prefer doing a clean install.

 

[malanh]

I ended up running through this process

How to remove Sirefef Trojan (Removal Guide)

the sfc scan now completes succesfully, and all seems well.

 

[Brink]

Great news Mathew. Thank you for posting back.

 

[metalcut]

hello folks sorry its been awhile since I posted. I've been really busy and haven't had time to work on this. I've tried all those options and none of them worked, however I did find a a different tool here .NET Framework Setup Verification Tool User's Guide - Aaron Stebner's WebLog - Site Home - MSDN Blogs and made me remember I had patched my themes .dll files for new visual styles and I'm thinking that has something to do with my problems. I attached the log file after it failed trying to verify the .NET framework 2.0 SP2 install.

 

[Brink]

Hello metalcut,

At this point, you might consider reinstalling Windows.

 

[stasioau]

Hi, I am sorry of my primitive question.
After run "sfc /scannow" have problem with my "Window Colorization". Does not work what kind of Aero Themes I can choose. Always I get typical Window Color and Appearance not list of colors.
Will appreciate help.