tamer3kz & sparx are both right, i also have windows vista RC1 and xp sp 2, both are registered, and some programs i can run fine on vista when they were installed on xp, but others that need reg entrys need to be installed again. All in all at the moment xp is the best to run programs on as all the drivers and stuff work, while vista is still an "nt" OS most of the drivers DO NOT WORK!! which can be a pain is the ..(you get the pic)BTW - a bit off topic there but either way, windows vista speech reconsion is 'fun'/handy to use !!