Win 7 x64 fails to boot

I've got a Win 7 x64 machine that locked up on me a couple days ago. I ignored it, turned it off and back on, used it for several hours without any problems. . Got home from work that day and was locked up again. Ignoring it again, turned it off and back on, and this time it will get to the Windows login screen successfully. After I try logging in it transitions to "Welcome" with the spinning circle to the left and that's are far as we go. Tried booting into safe mode and it hangs at c:\win\sys32\classpnp.sys. Hit F8 after power cycle and chose "Repair Computer". Tried Startup Repair (found no problems), tried System Restore (errors before completion), opened command prompt and tried sfc /scannow (says a startup repair is in progress, please restart then try sfc again). Also ran mfg diagnostics on hdd just in case (passed both DST and long tests). Reinstalling isn't out of the question but it'd be nice to know how to fix this without reinstalling if possible. Thanks in advance.
GCITechAsked:
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GCITechConnect With a Mentor Author Commented:
I swapped video cards and the problem seems to have gone away. It hasn't turned off or locked up since.
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MaxterJFCommented:
First of all, have you tried logging with another user?

It looks so much like a damaged profile.  But if you cannot repair, it could be more than that...

Anyway! Try fist logging with another user.  If it doesn't work either, do a mem test.  

If you don't have another user configured on your Windows, then you should do it in the future.  First thing to do when you get infected, get a damage profile, get crappy stuffs at the logging is to use another profile to make sure you don't load craps.
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Justin YeungSenior Systems EngineerCommented:
try to disable APIC setting under system Bios and see if you can get into windows normal.
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jaustin1Commented:
How long have you tried waiting on the "Welcome" screen?  If it's doing some processing/repairing in the background it could take awhile.  I'd try leaving it there for awhile (overnight) and see if you get any results that way.
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LeeTutorretiredCommented:
when you get to Repair Computer, try going to the Command Prompt and run chkdsk on the hard disk.  The article below is for Windows Vista, but it works the same in Win7:

http://www.bleepingcomputer.com/tutorials/tutorial147.html
How to use the Command Prompt in the Vista Windows Recovery Environment
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GCITechAuthor Commented:
Ok, got home from work today and tried to login to a different profile first. Loaded different profile just fine so I decided to try the "defective" one again and it also logged in fine. Used the computer for about an hour w/o any problems. Updated MSE and it started a scan. I left for a few hours and came back to it locked up halfway through the MSE scan. Currently running memtest, will report back results in the morning.
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GCITechAuthor Commented:
Memtest has been running for 8 hours, has made 8 passes with 0 errors. What should I do next?
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Justin YeungSenior Systems EngineerCommented:
try sfc /scannow
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GCITechAuthor Commented:
Tried running sfc from "repair computer" but still says something about "a repair operation is pending, reboot then run sfc". Rebooted and logged into my profile and ran sfc /scannow. Upon finishing it found no integrity violations.
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Justin YeungSenior Systems EngineerCommented:
run cmd.exe as administrator (do run as option) and then sfc /scannow with in the comannd prompt
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GCITechAuthor Commented:
That's what I did. Sorry for not mentioning it.
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Justin YeungSenior Systems EngineerCommented:
it is probably hardware issue, try to run burn in test and see if there is any error on your hardware
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GCITechAuthor Commented:
Ran burn in and it passed all the tests.
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LeeTutorretiredCommented:
Did you try my idea of running CHKDSK on the hard disk from the Recovery Environment?
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GCITechAuthor Commented:
I'll try that this afternoon and let you know. Thanks for all the help thus far.
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GCITechAuthor Commented:
Ran chkdsk from recovery environment, said it fixed some things. Rebooted, and logged into my profile. Machine locks up before it finishes loading everything.
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GCITechAuthor Commented:
Any more ideas....?
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