Thanks for the answer. This driver works fine. Before this driver I also tried
22.214.171.12473 (did not worked)
126.96.36.19968 (did not worked)
188.8.131.5258 (It worked fine)
I have then tried 184.108.40.20684. This also worked. I think this a more latest version of driver of your link.
Performance of both working drivers is same.
One thing is strange that the 3d performance of my x4500 is slower than x3100.
I think this is a seperate issue so I will post it in another thread.
Thanks for help.