I'm not quite sure what you've done since C: drive is usually where Windows is installed. Be careful with whatever changes you make including using the stuff I am posting.
You can find the Driver letter change dialog in Win7 and earlier here:
Right click on My Computer
Select Manage
Go to Storage-> Disk management
Right click on appropriate drive
Select Change drive letter
The first time it attempted to, but I accidentally said cancel when it told me theres not enough room on drive to restore. After that the lettering changed
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