Screen turns green while playin

Hi,
1. Im from germany so excuse my bad english .
My Problem is that Every time i play a newer game like: Dark MEssiah, The Witcher or Juiced2, my screen turns green after a while of playin.
A ScreenShot.
And that are the tempratueres:>click<
My System is:
>MB: ASRock dual vista 775<
>CPU: INtel core 2 Duo 56300<
>Graka: Geforce 7600gt<
>Ram: 2gb GEIL<

Somebody has told me that it could deal with the
PSU (hope its the right word i mean this thing wich gives the System the energy) so ife bought a new one but the problem is still there.
Hope somebody can help me.

 

Welcome to HWF

Do you have the latest geforce graphics driver (grafik treiber) installed?
You can download it at NVIDIA Home

 

Yes if installed the newest version just a few weaks ago.
Ife just bin to my Computer store and they`ll give me a new one hope it will work better.

 

What PSU did you have, and what PSU did you replace it with?

 

Ive had a no name psu with 320W.
And i replaced it with a Tagan 420W psu.
(22a on 12v line)