I've been trying to format my Dell XPS420 and after pressing F8 get as far as selecting "Repair your computer" in the Advanced boot options window. When I press enter it either takes me straight to Windows log on screen (Vista...sux..I know!!) or to "windows did not shutdown correctly or risk of losing data blah blah." Do I need to disable something in my admin or security tools in order to get past this??? Also tried my Op. systems disk but this just restarts the computer every time and I go through the same crap again!! Help!!! ps...Vista sux.