|You don't need any disk. |
If you want to remove it there are a few things that you need to know about. One is how it boots and selects the OS's. Usually mint puts what is called grub. You can leave it if you want or put MS's boot loader.
Second is how OS's are installed. Usually mint is installed on a partition. Use disk manager in XP to see if there is more than one partition. C drive ought to be shown first.
Lastly is mint has a unique way to install. It can install to a file on xp. So if you can't find any extra partition then all you have to do is delete the file.
Repost this on linux forums if you want too.
I support the 'Everybody Draw Mohammed Day'. A religion doesn't deny my freedom.