Windows 7 login screen rapidly flashing after Windows updates

Good morning everyone,



After last night's round of updates I have about 40 PC's with this issue. PC boots to welcome screen then freezes and the screen rapidly flashes. Same result when booted into safe mode. All PC's are Dell Vostro 360s. Short of formatting all of them I don't know what to do. Ctrl-alt-del does nothing. They are basically disabled and stuck at the rapid flashing welcome screen. Seems like a video driver issue to me but I have no way of uninstalling or installing a new one.



Thanks for any help in advance!
Decker_1Asked:
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JohnBusiness Consultant (Owner)Commented:
I have done all the updates on Lenovo machines and no issues at this point.  So your observation on Video (and so also Chipset) may be valid.

Can you boot a problem computer with a bootable CD and have it stable?  You could perhaps install a new video driver this way.

I have about 40 PC's with this issue  <-- Have you called Dell Support and escalated?  They should hold your hand and provide a working solution immediately.
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Zac HarrisSystems Administrator Commented:
I ran into this issue not too long ago and it had to do with the Facial Recognition on my Dell. I renamed the files FACredProv.dll and FACredProv2.dll, they are under C:\Windows\system32 and the issue went away.

Of course to do this I had to login to the machine via safe mode.

HTH
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JeffMatthiasCommented:
Either Uninstall windows update Windows Update - KB3097877
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Zac HarrisSystems Administrator Commented:
KB3097877 deals with embedded fonts. More specifically a document or web page with embedded fonts. I'm not seeing the connection...
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klh5246Commented:
Jeff is correct. Uninstalling that update does resolve the issue.
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Decker_1Author Commented:
Since I was unable to boot into Windows I did the following which solved the issue (and uninstalled the update)

F8
Repair your computer
system restore
system restore will fail
reboot anyway and all is well.

I also ran SFC /SCANNOW just to check the files.

I did find that if you can get safe mode with CMD to load SFC /SCANNOW will fix the issue. I only got that lucky on one PC though.
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JohnBusiness Consultant (Owner)Commented:
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shakhzCommented:
I connected external monitor - no flashing on it,  and could uninstall Windows Update - KB3097877
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JohnBusiness Consultant (Owner)Commented:
If the external monitor does not flash, you have a hardware problem. Faulty screen, inverter, or connecting cable.

The windows update above will have nothing to do with this issue now that you have more fully described it.
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shakhzCommented:
After windows update - 2 laptops (hp ellitebook) start flashing.
(no hardware problem on them before and after).

I connected external monitor -  it still flashing on the laptops screen (I closed the lid),
 but on the the external monitor I got steady picture.

I installed Windows Update - KB3097877 - no problem on the laptops.





It stop flashing after  only!

It happened on two laptops (hp ellitebook).
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shakhzCommented:
uninstall - sorry
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