I decided to install vista, and try it out on my desktop (already have it on my laptop and it's great). right away it gave me some trouble. i didn'tthink much of ta at the time, but when i was installing vista it asked me about partitions, so i set up a c: and a d:, vista itself runs great, the one problem i have is that i left a usb external HDD pluged in when i installed vista. now that drive shows up as a GPT protected drive. it won't let me access the drive in vista, and i don't think xp can do anything with it either. is there anyway for me to undo this and save my data? or is it all gone?