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Windows 7: Can't boot after running CCleaner

22 Aug 2014   #1

Windows 7 64-bit Home Premium
Can't boot after running CCleaner

So after reading an article on must have programs on PCgamer, I downloaded and ran CCleaner's cache cleaner and registry clean up. Computer ran fine afterward but figured I should restart and is gave me a BSOD on restart. I used installation disk and ran startup repair and was able to get logged in again. After next reboot it again gave me a BSOD and now startup repair won't fix it. Tried system restore and that didn't work either. Have run chkdsk and nothing found. Tried running sfc but it says a system repair is in progress and requires a reboot, but after rebooting I get the same message. Any suggestions?

My System SpecsSystem Spec
23 Aug 2014   #2

Windows 7 Ultimate 64-bit

Did you allow CCleaner to back up before hand?
My System SpecsSystem Spec
23 Aug 2014   #3

Windows 7 64-bit Home Premium

Under Cleaner I left the defaults and clicked Analyze and then Run Cleaner. For Registry I clicked Scan for Issues and then Fix selected issues.
My System SpecsSystem Spec

23 Aug 2014   #4

Windows 7 Ultimate 64-bit

When you clean your registry it would have asked you if you wanted to back up first.
My System SpecsSystem Spec
23 Aug 2014   #5

Windows 7 Ultimate 64-bit, Windows 8.1 64-bit, Mac OS X 10.10, Linux Mint 17, Windows 10 Pro TP

For Registry I clicked Scan for Issues and then Fix selected issues.
There's always been a prompt when clicking "Fix selected issues" to first back up the Registry, creates a file starting with cc in the Documents Folder that can be used for restoring the Registry.
My System SpecsSystem Spec
23 Aug 2014   #6
Layback Bear

Windows 7 Pro. 64/SP-1

Yes Ccleaner does have that prompt unless the user turns the prompt off.
Default is the warning/requests in on/activated.
My System SpecsSystem Spec
23 Aug 2014   #7

Windows 7 64-bit Home Premium

Ok, so I'm sure I did so then. Without being able to log in, how can I use it?
My System SpecsSystem Spec
23 Aug 2014   #8

Windows 10 Pro X64

Enable the hidden Administrator account from a Win 7 install DVD (WinRE)

See here: User Account Password - Change from WinRE

See if you can boot to Safe Mode (press F8 at boot) and login as Administrator.

If yes, open Windows Explorer and navigate to your normal login accounts My Documents folder and find the backup, it will be called something like cc_20140816_231827.reg, which is


Right click on it and select Merge to add the entries back into the registry.

Reboot and if that was the cause of the problem all should be well.
My System SpecsSystem Spec
23 Aug 2014   #9

Windows 7 64-bit Home Premium

Thanks, good info, but I'm not able to get to the advanced boot menu. Even if I press F8 or F5 it just skips that screen (I see it flash by) and go straight to a Windows Error Recovery screen.
My System SpecsSystem Spec
24 Aug 2014   #10

Windows 10 Pro X64

You can try this then:

Boot the install DVD and take the Repair path to get to a Command Prompt then do the following:

cd c:\windows\system32\config
ren system system.sav
copy regback\system system

This puts the last backedup copy of system in place of the current, messed up, system.

Exit and reboot, see if that allows you to login. If yes, try a System Restore now, even though it did not work before it may work.

Note that C: may not be the right drive letter for your boot drive. It's often different when you boot via DVD or flash drive. To find it, enter bcdedit from the Command Prompt. Output will be something like this (what mine looks like)


Windows Boot Manager
identifier              {bootmgr}
device                  partition=\Device\HarddiskVolume3
path                    \EFI\Microsoft\Boot\bootmgfw.efi
description             Windows Boot Manager
locale                  en-US
inherit                 {globalsettings}
integrityservices       Enable
default                 {current}
resumeobject            {6a5e5b97-6999-11e3-be70-40f02f1a4b14}
displayorder            {current}
toolsdisplayorder       {memdiag}
timeout                 0

Windows Boot Loader
identifier              {current}
device                  partition=C:
path                    \WINDOWS\system32\winload.efi
description             Windows 8.1
locale                  en-US
inherit                 {bootloadersettings}
recoverysequence        {6a5e5b99-6999-11e3-be70-40f02f1a4b14}
integrityservices       Enable
recoveryenabled         Yes
isolatedcontext         Yes
allowedinmemorysettings 0x15000075
osdevice                partition=C:
systemroot              \WINDOWS
resumeobject            {6a5e5b97-6999-11e3-be70-40f02f1a4b14}
nx                      OptIn
numproc                 8
bootmenupolicy          Legacy
usefirmwarepcisettings  No
The default entry under Windows Boot Manager points to the default boot partition {current}.
Find identifier {current} under Windows Boot Loader, the device entry there points to the drive letter you need to use, partition=C: in my case.

If this doesn't help, just del system and ren system.sav system to get back to where you are now.
My System SpecsSystem Spec

 Can't boot after running CCleaner

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