I have the same problem as roadkill1234. I had a GF 4 MX, switched it out with a 9700 Pro, and later put the GF 4 MX back in. In any case, I was running constant 100's with the GF 4 before I replaced it. But now, I get severe fps drops. I have tried reinstalling Windows XP Pro but to no avail. At the moment, I am using a ATI 9000 Pro 128 MB and I get drops down to 40! Norton does not detect any viruses on my computer. In my case, could there be another problem?