I have now tested Win7 doing various kinds of work and I had thought that Xvid4psp was at fault. Now I find virtually every kind of task runs much slower than XP. I have a machine with a MSI k9n6pgm2-v motherboard, AMD Phenom 2 quad core, 4gigs memory, and numerous WD drives. I have installed Win7x64 and XPx32 on two dataports so that I can test each doing varius kinds of work. I especially concentrated on long running processes like encoding video. I had been told that the codecs were responsible so I tested an AVI to AVI uncompressed encode. My final conclusion is Win7 is slow. Internet slow. File copy slow. Video encoding slow. Audio editing slow. Its just slow.