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Sounds like you've either got a virus or a pretty nasty corruption somewhere.
I'd throw that windows disk in and try booting from that. Assuming that you're input devices function properly, you can get to the repair (can't remember if Windows 7 media has a command line option), and you'll want to either follow the gui for the repair utility, or run an sfc /scannow command. Make sure you run a chkdisk if it has an option (or just use the chkdsk C: on the cli if you can interact).
Try that out first. If that doesn't work, then methinks that you have something rather nasty or really bad drivers. Its a little strange to me that you'd lose pretty much all IO devices if it were drivers, but it could be a motherboard driver or something of the sorts (install that from media if you have it). Things to consider as well are changes; did any hardware change or did you take a recent software update?
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