Save all of your files from your %pc profile%/USER. This includes the desktop, and all of that. Get and save any files you have access to.
Now, go into IT, and ask ff you log INTO A DOMAIN. If you do, have them just delete your account first( from the local computer, not the AD).
Or, if it is your computer, and you don't log into a domain, then get into safe mode, make another account and make that account an administrator. Save all of your files as you did before. Now, log into the PC with the new ADMIN account you just created, and delete your profile. Now Log off. Reboot. Log back in as same ADMIN you just created, and make a new account with what ever name you wish. Paste your files back where they were!
If neither of these work, then save all of your files via safe mode, and have IT do their thing!
It's kind of fun to do the impossible! -Walter Elias Disney