Not running ATI on my PC's now,but when I did not long ago,I went with the dot net framework 1.xx when ATI said I should. Worked ok, as far as I could determine there was no downside. But because of what I read from others experiences,I refused to go to the 2.xx version. I agree with Train,if it ain't broke,etc.-etc. If your interested,a very good site concerning all things ATI is this one ...