I have no problems with Pre-SP products, I have been using XP since release. Vista I used after release, maybe if I had used it longer I would of found they fixed my problems, but at that time I wasn't to happy to not be able to play some of my games so I rolled back to XP. I will have to say, I would probably have no problems now running Vista, for as they did updates that cleaned most of the problems I had. I mentioned SP1 because I heard they also fixed some of the memory usage problems with that update. Though that would be just going by the tech rumors and I wanted to see myself.