I now have two Dell PCs, one with XP and one with Vista, I want to use the new Vista machine for music, videos, entertainment apps, downloading MP3s, e-mail, browsing the net, etc. I also day-trade the stock market and I want to use the older Dell PC strictly for my stock trading platform software (planning on getting a new HDD and another XP Pro OS disk to do a fresh install of XP on the Optiplex). As the title says, I want to remove the HDD from my two year old Dell Optiplex that's running XP Pro and install it into my new Dell XPS 420 that has Vista Home Premium loaded. I want to be able to boot to either OS in the XPS 420. I know I'll have to get the correct drivers for the XPS 420 components and install them onto the XP drive, but I don't want to have to reinstall XP on the HDD I'm moving to the new Dell XPS machine. Anyone know if this is possible with Dell PCs? If so, what steps do I take after I've installed the HDD from the Optiplex into the XPS 420? Any help you guys can offer would be greatly appreciated as I don't want to loose my Adobe apps.