I have not Used Vista. Read one too many not-so-good reviews. Basically Compatibality. I download lots of software almost 99 % of software are made with Windows XP in mind. MIcrosoft is saying it will stop support for XP in 2008. I can seriously say they will extend that to 2010 if not 20012. More that half the PCs cannot Run VISTA and People just can't go Upgrading every two years.