EDIT: Looks like it sorted itself out. Thanks to all who gave advice.
Well, shit.
It looks like New Vegas has actually killed my computer. So, it crashed, looped the computer like Fallout 3 keeps doing when I'm in tranquility lane. No big deal, right? Just kill the power and reboot. Well, that didn't work too well, because it would just start up in the same state, never getting to bios. So, I left it alone for the night, hoping it would be better this morning. And it was. For a minute. I was listening to music, to try and make sure it wasn't going to crash before I started playing, and as the song was nearing the end, guess what? It blue-screened. Reboot, go the to C:\ drive to locate the files the error report was going to reference, because god forbid Microsoft design it so users can read the actual error reports they're sending out from the error reporting window, and as soon as I clicked on the drive, it crashed.
I reboot, as soon as windows starts up, it bluescreens.
Finally, it froze on bios.
Any ideas? Because I don't know what's causing this, and I doubt I can afford to replace it if it can't be fixed.
Oh yeah, and the current version of Colony 42 is on that computer, too. Crap.
As for the whole pc being fucked up, that's your fault. You shouldn't have kept playing it and damaging your pc any further.
If not, check if everything is correctly inserted into its socket. If what skals said is true, I mean if your video card is overheating(or the CPU), that may be your problem. If not, your power supply is.
Anyway, it's sorted itself out now, so no permanent harm done. Thanks to everyone!