I upgraded from Vista (with which I never had a problem). It took several attempts before it finally loaded. Then the monitor started rolling (like a bad video tape). I called Microsoft, they suggested I download a driver for the monitor. That limited the number of times the screen rolled, but it still does it from time to time. My PC is an HP Pavilion IQ506 Desktop PC - Intel Core 2 Duo T5850, 4GB, 500GB, DVDRW, 9300M GS, Tuner, 802.11n, Vista Home Premium 64, 22". I had to delete the Touchsmart programming before W7 would load.