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Windows 7 STOP 0x00000051


About 10 days ago something happened to a Windows 7 PC as all Office programs stopped working - error message was something related to incompatible 32 or 64-bit version, even though it had been working fine for 3-4 years. So, the only way forward was to re-install Windows 7 and all the applications.
So this is what I did and returned the PC back to my client about a week ago. Everything was fine for about 3-4 days when I got a phone call that Windows is crashing with BSOD.

The error message says:
STOP: 0x00000051

This happens after the user has logged on to the Desktop.

PC loads fine in all Safe Mode options, including Safe Mode with networking

This is what I've done up to now:

Uploaded the .dmp to BlueScreenView where it highlighted ntoskrnl.exe in red (I've also added the dmp file to this thread)
sfc /scannow - nothing
chkdsk - not errors
Tried clean boot (unticked everything from the Startup using msconfig)
Uninstalled Norton
Scanned the registry with CCleaner
Followed instructions here to no avail: https://answers.microsoft.com/en-us/windows/forum/windows_7-update/win7-bsod-registryerror-ntoskrnlexe-bugcheck-code/2f7ab355-0753-4413-89ea-c5ced69ef750

Any help much appreciated.
Windows OSWindows 7

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Last Comment

8/22/2022 - Mon