I don't know why you'd want to do that why not dual boot if you have to have windows,
in any event you should be able to just put the windows install disk in and it will reformat the drive for you.
or you can use GParted an delete the current partitions and add new ntfs partitions.
I believe gparted is on the mint live CD if not it can be downloaded from here http://gparted.sourceforge.net/download.php
Sorry to see you go
Thanks for your help!
I would actually prefer to dual boot but I am not sure how. Right now I already dual boot with Mint and Ubuntu. My Ubuntu size is around 50GB, I would like to replace this partition with Windows 7.
When I load the Windows 7 disk it says that I can't install there because it is a different file system, and it doesn't even enable me the edit and modify options of the installer.
Would you recommend that I use the Disk Utility for formatting? and if I do so will my GRUB loader stay where it is?
Thanks again for your help