Big Problem, 8 big pics 1 small, not for slow computers Options

[2kool4u526]

About 1- 2 months ago, I got a new ATI Radeon 9800 Pro graphics card (the one i had before hat was a nividia tnt2 pro) I got a new one to play C&C 3 and other games. But there has been a reoccuring problem with the video card, sometimes after playing C&C 3 for a while I will start to have problems with it, as seen below:
These problems are on Tiberian Sun, Renegade, Generals, and C&C 3
I'm hoping someone could help me out?





















This was happening earlier today, it's gone now, but it will reoccur sometime later, it reoccurs faster if my C&C 3 shader detail is on High so I keep it on low