Windows 7 Forums
Welcome to Windows 7 Forums. Our forum is dedicated to helping you find support and solutions for any problems regarding your Windows 7 PC be it Dell, HP, Acer, Asus or a custom build. We also provide an extensive Windows 7 tutorial section that covers a wide range of tips and tricks.

Windows 7: SFC SCANNOW found corrupt files cannot repair, the iasrecst.dll file

13 Jan 2019   #1

windows 7 home premium 64bit
SFC SCANNOW found corrupt files cannot repair, the iasrecst.dll file

Hello all ..this is my first post and I'm new to the forums. I appreciate any help in advance
So my problem is I ran a scan with Malwarebytes last December 16th 2018 and a file named iasrecst.dll in C:window\SysWOW64 came back as a trojan, immediately quarantined it.

This week I ran a sfc /scannow to do a system checkup and got the dreaded message that windows resource protection found corrupt files but could not repair them. I checked my CBS log and found that the iasrecst.dll was the culprit. Turns out Malwarebytes made a big mistake, that is an important application extension for the operating system and was a false positive that should never have been quarantined in the first place.

I checked the file on virus total and it's clean. returned it from quarantine thinking my sfc scan would go back to normal but it's still coming back with that file is corrupt. I'm not sure why. I have windows 7 home premium, I tried sfcfix and it came back with no errors. DISM isn't available for windows 7 users, I tried that. So if anyone can help I would greatly appreciate it. I just want it back to normal. I also have a good copy of the iasrecst.dll file on a flash drive from another computer with the same OS I can use if anyone has any ideas for that. Here is the error from my CBS log if that helps. Thank you all so much!

2019-01-13 01:18:56, Info CSI 00000321 [SR] Cannot repair member file [l:24{12}]"iasrecst.dll" of Microsoft-Windows-Networking-Internet_Authentication_Service_DataStore, Version = 6.1.7601.17514, pA = PROCESSOR_ARCHITECTURE_IA32_ON_WIN64 (10), Culture neutral, VersionScope = 1 nonSxS, PublicKeyToken = {l:8 b:31bf3856ad364e35}, Type neutral, TypeName neutral, PublicKey neutral in the store, hash mismatch

My System SpecsSystem Spec
13 Jan 2019   #2

W7 home premium 32bit/W7HP 64bit/w10 tp insider ring

Hi Thumpergirl,


is that Quarentineed file still there, or did you request delete, usually held for 30 days before auto delete.

My System SpecsSystem Spec
13 Jan 2019   #3

windows 7 home premium 64bit

Hello Roy,
Thank you for your reply. Luckily I did have the file in quarantine still. I keep them as a safety precaution and fortunately Malwarebytes doesn't automatically delete after 30 days, the user has the option to do so. I stated in my post I had returned it from quarantine but the sfc scan still had the file as corrupt..not sure if my post shows up on your end entirely. This is an issue posted on the Malwarebytes forum as well but has no resolution yet. They don't seem to know what to do.
My System SpecsSystem Spec


 SFC SCANNOW found corrupt files cannot repair, the iasrecst.dll file

Thread Tools

Similar help and support threads
Thread Forum
sfc \scannow found corrupt files.
:D Windows Resource protection found corrupt files but was unable to fix some of them. In the CBS folder there is one text file and five .cab files. I can't open the text file. Says I have to get a "license" ?? :confused: So I presume some of my WIM files are corrupt. I'd like to manually...
Performance & Maintenance
I ran sfc/scannow and found corrupt files, how do I fix this?
I ran sfc/scannow through cmd and found corrupt files. Any help would be appreciated and since I'm not good at at these sorts of things, please be patient with me and I'll try my best to follow your guidance :) , thank you. Should I upload the whole cbs log or just the corrputed parts?
Performance & Maintenance
Sfc /Scannow found corrupt files but was unable to fix some of them
I made 3 scans using Sfc /Scannow but still the corrupted files are there, so I used the Option Three using the CBS.log but then I not that techie to understand which files are corrupted that are stated at the sfcdetails.txt file
Performance & Maintenance
SFC /Scannow found corrupt files, is it necessary to fix?
Hello, I have a Windows 7 Starter Netbook with Intel Atom. I decided to do a SFC /Scannow command on it, despite it not experiencing any issues for a test. (Quite the opposite actually, very fast under 30 second startup, best health yet) But, it found corrupt files. I ran SFC /Scannow 4 times...
Performance & Maintenance
SFC/scannow found corrupt file CBS.log help
hi, i ran sfc/scannow and i found a corrupt file and cannot fix after the scan. heres the CBS.log, please help and thanks. Also ive been having a problem with my computer, its been shutting off randomly. but the computer fans keep running and the light stays on. the mouse and keyboard turn...
Performance & Maintenance

Our Sites

Site Links

About Us

Find Us

Windows 7 Forums is an independent web site and has not been authorized, sponsored, or otherwise approved by Microsoft Corporation. "Windows 7" and related materials are trademarks of Microsoft Corp.

Designer Media Ltd

All times are GMT -5. The time now is 13:31.
Twitter Facebook Google+