If you don't reformat when you uninstall than all your files should be nice other than the ones in c:windows.

When it asks select "Leave the Current file system intact"......

I'll walk you through it just in case.

1) Change the boot priority and make your cdrom drive number one priority so it..... inspects your cdrom drive before anything else of course it finds a compatible startup cd. You have to do this in bios, before your computer is booted up. There mabye a button that you have to press like [del] or [f1]. Than Restart

2) Press any key to boot from the cd, it will say. What do you do?

3) Wait for the bloody thing to load, it takes ages.

4) Now as you continue through the setup it will tell you there is another os already installed, we want to install over it so select the appropriate option and DONT reformat as mentioned before.

5) 1 hour later your pc will be refreshed and you still have your old files, but that doesnt mean that itunes will work. Its probably complicated like steam. Itunes could of put files into c:windows and this is the file where the xp os is. But anyway I have anw'ed your question. Time to do a spell check.