I bought a Dell laptop with Vista back in 2008 for musical uses. After about 2 days, I bought and installed XP Pro as I really didn't like Vista. After running this for 5 years with no issues, Microsoft decided my copy of XP was not a genuine one today during a routine Windows update. Nothing I could try with product key updates or whatever could get them to recognise what had been working perfectly for 5 years. "Windows Genuine Advantage", my arse. So, I tried a completely clean install of Win7 from an HP upgrade DVD that came with a totally different PC. It installed and activated online with no issues whatsoever. I cannot explain how this works. Really odd. Now I have to reinstall all my studio stuff. The upside is I was planning to switch to Win7 anyway and the machine did need a clean up.