wow, I've been having trouble with vista on my wife's laptop for months. Nothing but errors and terrible lagging, it would hang for up to 30 mins on some stuff. I had virus scans, removed everything, reinstalled, formatted, everything!
Windows 7 installed in about 20 minutes, updated and installed some necessaries in another 15 and now its running perfect, all drivers working and working fast.
This thing rocks, it even got the tablet touchscreen stuff working on the first boot