I have windows 7 ultimate 64 bit and I ran into some problems while upgrading the HDD. At this point I think it would be best to just start over and clean install. I feel like my OS was starting to get gunked up anyway. So, I made a list of all my software and know where to get it all again. Problem is, I don't have my original install disc anymore. I don't know where I put it after moving. I have my valid key that I was able to get off the computer with a program. How can I start over fresh though without my actual installation disc?