computer color problem

okay, first i thought it was my monitor or windows 7 doing something, but now i dont know.. i just installed XP SP3 instead so i could use photoshop once again, but, the problem persist >.< when i use colors, they turn out like this

this is what happens when i use any size of brush. the picture is taken with a 100 pixel brush.
http://i174.photobucket.com/albums/w...Untitled-5.png

im pissed now that i cant do my work ... there must be something to fix this, i have tried to play around in the RGB settings in photoshop but with no luck

W7 drivers are different than those of XP and Vista. Different core architecture if you are wondering why.

I'm running out of options here though.

To be honest, you are experiencing an artifact as you have noticed. The issue here is I can't see a plausible source for the GPU damage causing the artifact.

The only things I can say to help you is to try another monitor, download HWMonitor and screenshot it while PC is idle and under load and while you are under load, take the most graphic intensive game you play on a regular basis and check for graphic anamaloties.