Windows 7 Hang at Login

Fujitsu Lifebook Windows7 Pro 64, current model, good condition, up-to-date anti-virus  s/w, no known malware history.
Starts up apparently normally but ceases to respond once reaching the login prompt - no response to mouse  and keyboard.
External mouse tried - still nothing, machine doesn't appear on network scan.
All hardware works normally when booting from Linux trial image.
Recovery disk applied - detects no startup problems, system restore by several days resolves problem.
Run ChkDsk and SFC /scannow without issue.
After 2 days of normal use the same thing happens.
Suspect a corrupt Windows update file - but how to clear?
Recovery disk now says that Windows not same version.
Boot menu system restore now says no system restore points found.
KD JohnsonIT ConsultantAsked:
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If you look at Windows Update in the control panel you can see  update history.  This shows you the date installed and the status.

If they all show successful you will need to systematically remove all the latest installed items.  Once they are removed you can re-apply them when requested by Windows.
KD JohnsonIT ConsultantAuthor Commented:
Thanks, but what puzzles me is that we had rolled back the Windows Update(s).  If there were a corrupt Windows Update file, then surely a fresh copy would have been downloaded on the next update cycle(?)

As a Fujitsu reseller I supply and manage lots of these machines - am typing this on one now - so I am quite sure that it's not a hardware compatibility problem or similar.

The immediate problem now is that the System Restore option now appears to be unusable.  We can access the file system via the Linux disk.  I know how to rollback the registry on Windows XP by accessing the file system, but not how to do it in Windows 7.
I think it would be worth running a diagnostic test from the hard drive manufacturer.  Something like Seagate's Seatools.

If you have removed the update then re-downloaded it then it is unlikely to be corrupt twice.  However, if when you download it is allocated to the same sector, that could be the issue.
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can you test if it happens also with a new user account? it may be corrupt
KD JohnsonIT ConsultantAuthor Commented:
We can't login at all - the system hangs at the Windows login screen.
Can you remove the drive, put it into a caddy and test it using the manufacturers tools via USB?  I've used that myself a few times.

The other alternative is to boot from the Windows CD or partition and see if it will repair the existing installation.
do not test the drive over usb
best boot from a CD or USB stick, with UBCD, and run the diags you want from it :
Hardware diagnostic CD    UBCD

go to the download page, scroll down to the mirror section, and  click on a mirror to start the download
Download the UBCD and make the cd   <<==on a WORKING PC, and boot the problem PC from it
Here 2 links, one to the general site, and a direct link to the download

since the downloaded file is an ISO file, eg ubcd527.iso - so you need to use an ISO burning tool
if you don't have that software, install cdburnerXP :

If you want also the Ram tested - run memtest86+ at least 1 full pass,  - you should have NO errors!
For disk Diagnostics run the disk diag for your disk brand (eg seagate diag for seagate drive)  from the HDD section -  long or advanced diag !  (runs at least for30 minutes)                        ultimate boot cd             download page

**  you can make a bootable cd - or bootable usb stick
KD JohnsonIT ConsultantAuthor Commented:
An update on this.  It turned out to be an issue (which doesn't appear that uncommon) wherein Windows had decided to condemn the USB drivers:

Windows cannot verify the digital signature for the drivers required for this device. A recent hardware or software change might have installed a file that is signed incorrectly or damaged, or that might be malicious software from an unknown source. (Code 52

It could be operated normally via remote access software (VNC etc) or by using the F8 boot screen option to disable device signature checking.  I tried various different versions of the USB drivers and as far as I can see there is nothing wrong with them - but Microsoft doesn't agree.  Unfortunately Microsoft also seems to have completely disabled any override mechanism other than the F8 option - I tried various registry entries and bcdedit options.  Every test that I could run on the hardware and every anti-malware test said that there was not a problem - it seems to be entirely a Windows issue.

In the end I bit the proverbial bullet, zapped the partitions and rebuilt the OS and apps from scratch - many more hours work.  It is now working perfectly - but what happened, how and why remains a mystery.

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probably an update that corrupted the drivers
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Windows 7

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