ATI 9800 Pro 128 locks up in Mohaa ?

I was using the 9700 all in wonder worked fine
than sold that card to a freind
Bought the 5900 fx and had texture fade outs
Now have the 9800 Pro and Mohaa freezes
solid , the whole computer locks up ???
Why newist Catalyst 3.8 driver
whats going on ???
Going to go the Gforce i think and ditch this card
Any thoughts on what to do ???