I have a dell inspiron 1521 originally running Vista home premium. Laptop was acting bad, not running properly etc. so I backed up my files and did a factory reset of Vista. All was working well, I had access to nearly all of my 600GB HD. I installed Windows 7 upgrade and downloaded Firefox. Upon the reboot I was asked to select Vista or Windows 7. I select 7 (as Vista no longer functions and I cannot access internet in Vista). I went to disk manager to shrink the partition but it does not show up. (It does separate the drives into C: D: etc but I do not see any designation for the missing 300GB) I tried to find C:\windows.old - it does not exist I tried to go back and do a system restore to factory settings in both Vista and 7, I cannot access anything (There is no old file to restore to nor can I access the factory reset). I am stuck with this it seems. I did not snapshot the screen because I didn't want to save anything when I did factory reset. I want to maintain my 7 upgrade or deactivate it and go back to Vista and reinstall if possible. My laptop keys are touchy and the laptop moved ahead on its own while the upgrade was happening so something could have gone wrong there but I don't know what. Please Help Here: I cannot locate nearly 300GB of HD space...any thoughts on how I can get that back? It looks like 7 is running from D:Recovery instead of C: How can a check/correct this? Thanks!