Basically I bought windows 2003 r2 OEM to upgrade my existing install of 2003 std, apparently because it's OEM, I need to do a fresh install rather that upgrade, does anyone have any experience of doing such a thing that's rather local (Based near Sheffield) in exchange for a beer 
Otherwise, is it a tough job deleting windows and doing a fresh install, then restoring data from a backup?

Otherwise, is it a tough job deleting windows and doing a fresh install, then restoring data from a backup?