You want to do a full install?
Boot into your Windows OS and uninstall wubi from the control panel.
Now create a bootable DVD or USB flash drive with Linux Mint in it. See http://www.psychocats.net/ubuntu/usb
A few notes before continuing:
-This will format the partition you are going to use for Linux Mint. (you'll lose data on this parition so backup the data)
-This partition will not be accessible/visible in Windows.
Now boot you Live Linux USB or DVD and click the Install Linux Mint icon on the desktop. On the installation screen, choose "do something else".
This will get you to the manual partitioning screen. Click the partition you want to allocate for Mint and click Change.
Set the partition size, Use as Ext4 Journaling Filesystem and mount point as /
Below you'll see the option on what device to install the bootloader, choose /dev/sda
Click again the Ext4 partition you created and check the format option.
Lastly, click Install Now. Let it do its thing and if everything worked as planned, you'll have a dual boot system.
"I learned a lot from repeatedly breaking my system and then reinstalling. Oh, and a lot of GOOGLE searches too!"