I got a discount price on a win7 upgrade cause I am in college. I had 32bit vista. I chose the 64bit win7 upgrade cause my pc can handle it easily. I understand to go from 32 to 64 a clean install is needed. So today I did the upgrade, and thought I did a clean install. I have two hard drives and chose the c:/ drive that vista was installed on. So I was assuming I would have a fresh c: drive with nothing but the os on it but I have 70 of 330gb free. All my music, pictures etc is still there along with a program files, program files (x86), a windows and a windows.old file. I backed up all my files I needed before the upgrade. Can i delete the files left over from vista or will it mess with the win7 upgrade. I would like to have my hard drive space back. Thanks in advance.