O.K. I have Vista home premium 64 bit and purchased win 7 professional upgrade when I go to install it says this is not compatible and I need to do a new/custom install and to back up all my files. My question is what is the best option to back up files. Especially large files like games. My daughter has all her sims and WOW stuff. I have a bunch of valve games that I don't have disks anymore urgh. Some I d/l directly from valve so I should be ok there. I have all my internet setting wow this is going to be alot of d/l. I do have an external HD but it has a bunch of XP files from my last comp on it? Can I just add my vista stuff to it? Thanks for the help...