I have had a problem after upgrading Windows 7 over Vista Home Premium. Spent at least 6 hours on the phone back and forth with Dell tech support and they could not help. Originally it was thought to be a video problem but all of their fixes did not work. When I installed 7, it went fine and worked well for the first few days. Then for a day or two, the desktop would not load then would after shutting down the computer but a simple restart fixed the problem. On Saturday, just the black screen with cursor. Was able to ctl-alt-del to task manager and start desktop by typing explorer.exe. It works fine from that point. I've run virus checks, reinstalled 7, and done countless adjustments with tech support with no fix. I've checked the support forums and most are specific to Vista issues and not Windows 7. I've looked at the Vista fixes, most of which lead me to the registry, but all of the things that I am told to check for are there (explorer.exe in the shell folders, etc.). Can anyone help with this??