Originally Posted by
GommeInc
The upgrade disc will work. You install the OS by inserting the disc - when it says type of installation you selected "Custom", not "Upgrade" and do not insert the serial code when it asks. Then you let it install. When it's done it should say something like "The version you have installed is incorrect, disc is an Upgrade disc only". After it's had a rant re-install by inserting the disc and instead of clicking "Custom" you click "Upgrade". When you're prompted about a serial code number, make sure you install it this time round. The installer will assume you're upgrading Windows 7 with Windows 7, and afterwards it should work.
I've done it about 3 or 4 times now.