lol mine did the same thing haha
but an easier way would be;
Go to control panel , and user accounts.
Create an account called ...anything,....um.. "testing"
Once your in the testing account, logoff your current account.
Go back to the testing account, save any of the needed documents from the other account ( by going to my computer and copying them)
Completely delete your old account while on the testing account ( delete files too? -> Yes )
Then reset up a main account for yourself and drag the files there. Then delete the testing account.
This is much more time friendly then formatting completely. Also, may be a good idea to run a defrag after doing this.
Have fun