Hi xpJohnson: The easiest way is as follows: 1.- Save first any personal files or folders kept into partitions 2 and 3 into an external device. 2.- Boot partition 3 (Win2) and format fast partition 2 (Win1). 3.- Insert the install DVD, reboot from it and reinstall Windows 7 into partition 2 (Win1). 4.- Go on doing as explained at paragraph 4. 5.- When you restore afterwards your personal files and folders you'd rather not use for it none of both Windows drives, but logical units. If you don't have any you only need to reduce the size of partition 2 or 3 (the biggest one) and create one or several logical units into the free left HDD space. As usually said, "never put all eggs into the same basket". Best wishes. cannie Thanks cannie, I have a few more questions. 1. What is the purpose of the format fast while running win2? 2. In 4.6 you mention the convenience of running win2 as default, what is the advantage? 3. Is winrar better for the backup than 7zip? I already have my files in the logical partition so I hope I am good there.