I got a windows 8 professional key from MSDNAA so I tried to upgrade my windows 7 ultimate x64 with the option to keep all the programs and settings but with the iso I downloaded from MSDNAA I keep getting the following error: First thing I did was checking my checksums and they were good, then I tried to download a bunch of different isos but I still couldn't get past this error. Then after reading some threads here I found somebody mentioning that the iso I tried is not an "upgrade" iso and so it wouldn't work for what I was trying to do. If the problem is actually related to the ISO not being an upgrade ISO, which one is an upgrade ISO? Nothing I could find would specify whether an ISO is upgrade or not. Could it also be something I have installed? I get this error before the installer can tell me what is good and what is not so I have no idea if there is something that may be conflicting with the installer, I could do an upgrade on another computer from 7 ultimate to 8 enterprise, I was forced to uninstall daemon tools and sandboxie. I uninstalled them from this one computer but it still doesn't work well. Any ideas?