I did a clean install of windows 7 professional over the Windows Vista Home Premium that came on my laptop (a XPS M1530) and it appeared to go smoothly. Once the install was completed I was having trouble with viewing screen savers and playing games (that I had played many times on my computer...
clean install
coincidence
cpu t8300
dell support
diagnostics
failure
game issues
hard drive
intel core
matshita drive
nvidia
professional
screen savers
upgrade
video card
wdcdrive
windows 7
windows vista
xps m1530