I installed Ubuntu 12.04 LTS using the windows installer, but now would just like to remove windows altogether. What is the best way to do this? Is there a way to do this other than using a CD/CVD or USB?
If I understood you well use Wubi Migrating tool, here you have documentation: https://help.ubuntu.com/community/MigrateWubi
Remember to plug the charger If you are using a laptop.