I presume you mean mint4win
Please see http://usbtux.hostzi.com/How_to
and specifically http://usbtux.hostzi.com/mint4win
Uninstall Linux Mint
If you that you don’t want to keep Linux Mint, you can easily uninstall it just like you would any other program installed in Windows. Open Control Panel, select Uninstall a program, and then browse to the Linux Mint entry. Click Uninstall/Change in the toolbar.
You can of course start the mint4win program tell it to install and it will remove the existing install before asking you to install again at this point press cancel