Computer constantly crashing on startup, even on safe mode

Startup repair has done nothing, and I'm stuck in a rut since I lost the password to my account on the PC a couple years back and have no idea what it is. I highly doubt it's a virus or malware since McAfee hasn't alerted me to anything, and in the past couple of days the only website I can remember visiting is Microsoft support for Xbox help, anyways, I believe Fallout 3, which I recently installed, and isn't optimized for Win 7, is the root of my problems. It was working without trouble until today, it crashed on startup and I restarted my computer, but got a BSoD while it was logging in. Startup repair said that unspecified changes to system configuration might've cause the problem. But, if I can access my hard drive and uninstall Fallout 3 I'm moderately confident that the problems will subside. Thanks.

*** STOP: 0x0000007B (0xFFFFF8800099A9928, 0xFFFFFFFF0000034, 0x0000000000000000, 0x0000000000000000)

Disregard the black screen stuff, I booted it up again to doublecheck the beeps and it started up, it's still giving me the same crash error though.

Maybe try running MemTest RAM - Test with Memtest86+ (it doesn't need Windows running to work) if you have bad memory it will let you know. If you have two sticks of RAM you could try pulling one, then start run windows, then if still no good, reinstall it and pull the other, to see if one went bad.

Also, there is a tutorial on this site that shows you how to reset a forgotten password (as long as you are logged in now with an administrator account).

I ran nine checks on the RAM program, and it got no results. My memory is clean. Can you link the password reset tutorial?

Until you get that tutorial link:

Do you have Administrator privileges on that PC? Computer-right click-manage-user accounts and groups-accounts-right click the account and set password.

Try Offline password Reset & Registry Editor - Offline Windows Password & Registry Editor

Edit: I see Layback Bear posted as I typed.