S!
Express, I assume you use the 9.12 drivers and get blocky text and garbled graphics. Same as I did with my 5870HD. What I did was dropping the atioglxx.dll from drivers 9.10 to IL2 folder and no more corruptions of any kind and game runs smoothly. Check the thread below "Latest ATI drivers" for more and there is also a thread at
ATI forums about this with conf.ini settings etc.