My computer keeps glitching up and freezing. Please help!

So yesterday my computer started blinking black with white marks on it. The only way to get out of the freeze was to restart it. This kept happening but at one point it started mirroring the wallpaper when it "highlighted" areas on the screen. It wont allow me to click on anything and when my sister went on it to her user, it did nothing. Also when it glitches up it makes rectangular white noise marks at random places and flashes black with the background. Please help me!!! Also I don't know what operaing system it is.

You have one of these.
http://support.apple.com/kb/ts2377
And there is nothing that can be done. Apple had a Recall on them but that is long over with. It only lasted 4 years from date of purchase.
About the only thing you can do is do a search for Baking a 2008 logic board. Or find an indepentant repair shop that can do basically the same thing. But that fix will only last so long before it starts to fail again.
There is  LONG thread on it on this forum. Something like Failed Logic Board. Dating back a few years.

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    edi: 0x00000000 esi: 0x00000001 ebp: 0xbffff678 esp: 0xbffff660
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