Here's the situation: I've got a 64 bit dell inspiron 15 that currently dual boots ubuntu 11.10, and backtrack 5r2. I've backed up all the data I need on both of these operating systems, and heres what I want: Dual booting ubuntu 12.04 and windows 7 (sometime before next month so I can run diablo 3). I can make any changes to the system neccesary. If I do a clean install of 12.04 and then install windows wont windows overwrite grub and make my ubuntu partition unreachable? My friend told me I can't do windows first because "theres no such thing as a clean install for windows".