@Game King,
You don't need to change your boot drive, you just need to change your habits and change the system a little.
Create a Program Files folder on your C drive, uninstall a couple of your applications, then reinstall them but specify the C:\Program Files folder. Do this for all future installs you run.
The next thing you can do is create a folder on the C drive, move all the files you don't need right now into the folder, then create a shortcut from your desktop to the folder so that you can get to them.
An alternative to that last step is to relocate your user folder(s) to your C drive, either individually, or all at once - I'd suggest the all-at-once method, although it is a little time consuming, it's cleaner.
http://support.microsoft.com/kb/314843/en-us - it's down the page a little.
