After upgrading from Vista to Windows 7, a friends laptop automatically starts the explorer window when you login to your account. How can you disable this? It isn't in the autostart menu @ CCleaner and the Restore previous folder option in the Folder Options of the Control Panel is disabled. Maybe it's something too simple..?
Btw, never had any trouble with that kind of stuff after a clean installation. Apparently an upgrade takes more than 3 hours, where a normal installation takes less than 1 hour.