I have 2 hard drives in my computer. My C drive has xp on it. I want to do a clean install with windows 7 on the 2nd harddrive and make it my primary drive. I believe I will have to reformat the drive, it is a fat32. I want to keep xp in the machine and boot from it when I need too or be able to dual boot. That way I don't have to worry about doing a clean install and I can save my 4 years of programs and files. My questions are 1) can I get and use a upgrade windows 7 disk. 2) do I have to change some of the hard drive cables and change jumper settings or can I just get a program like OSL 2000 boot manager and boot from either 7 or xp without making any hardward chages except reformating the disk and installing windows 7 in what is now my D drive.