When ever I launch SC2 everything is fine until the game starts then 2 seconds later the game video disappears and I get a bunch of blue diagonal lines across the screen. If I press alt + Tab (to go to the desktop) then press it again (to go back to the game) it reverts back to normal and doesn't happen again unless I completly exit out of SC2 and start up again.

Asus P5B Deluxe
Nvidia Geforce 7900 GT
Intel core 2 6600 2.4 ghz
2 gig mem (3 gig total, memory remap is enabled, tried disabled and no change just in case you ask lol)
windows xp sp3

Nvidia drivers have been updated with (197.45_desktop_winxp_32bit_english_whql.exe)
driver date 4/3/2010
driver version 6.14.11.9745

I have a unlisted video of this if you need to see the problem, I will post a link if requested..I didn't post it now because I don't want to violate any forum rules)

Any suggestions?

Nrgstar,

It sounds like your video card is overheating. Be sure to clear out any dust, especially around your video card and make sure there is proper circulation in your system.

You can also use the following program to monitor your system temps:
http://www.cpuid.com/hwmonitor.php