My computer screen splits, and is very pixelated

Hey
Lately, my computer has been malfunctioning. I'm not sure of it's a virus, but o didn't download much off the internet lately, so I don't thnk it is. Here's what happens:

1. Computer freezes
2. Random pixels or chunks of the screen jerk around
3. Screen goes black and reboots
4. The screen now splits into about 8 miniature screens, each synchronized and depicting the same thing
5. All of the reboot screens are very chunky, pixellated, boxy and you can just barely make out what some of it is saying. Mouse still functions and so does the keyboard
6. After manually rebooting the computer, the same thing happens.
7. All detailed colors are replaced by just the main (or most abundant) color

I can't use my computer at all like this, so please help!
I have an HP Pavilion Entertainment PC (dv2500) with Windows Vista 64-bit. My graphics card is by Nvidia.

Thanks,
Brian L
 
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