I upgraded to windows 7 ulti 64-bit from windows 7 home premium 32-bit. I installed 7 ulti on a different disk than the one with home premium, and am now trying to delete everything on my old drive. but I can't. I really don't know what I did wrong, and I tried 3 different ways to clear the drive. it just won't let me, and now I can't even see the drive in "My computer". I'm usually alright with figuring this stuff out, but I'm just clueless.