Right, i unplugged D: reinstalled win 7 on C:, but now it won't even let me get to the bootmenu without the dvd inserted. All i get is a black screen with a little "-" flashing in the top left corner.
So i tried plugging back in D: and starting C: safemode and when i then try to format D: i get "System partition is not allowed to be formatted".
Hm, i might've gotten this wrong. The full version disk won't ask if you want to upgrade? and just head straight on to the installation instead? In that case i guess i'm wrong and i've got an upgrade disk, as i've installed 7 with "custom install" as i didn't have a 64bit vista to upgrade from.
I guess this means that i'll have to backup everything on my external hdd and format the lot?