Recently I purchased a new laptop with Windows 7 Premium and a Windows 7 Pro upgrade DVD. It was only during this process that I discovered that you can’t upgrade. The process insists on replacing the entire operating system.
At the end of this I was left with a PC with a VGA display and no network stack. I can’t believe that a modern operating system fails to install a minimal network connection.
Eventually I found that the restore process provides an installer that provides the 5 missing drivers. Why the upgrade process could not have copied them from the previous installation is best put to the developers at microsoft. In addtion could someone explain why a machine needs to reboot 5 times?
Developer Rants 