Do you have your Windows CD? If so, all you need to do is put it in the CD drive, reboot into the setup and follow the prompts. Make sure you tell it you want to do a clean install not a re-install, and format the drive using NTFS.
This is assuming it's Windows XP. If it's an earlier version, you may need boot floppies.
You don't need admin access to do a format/ clean install. It will set up a new admin account for you in the process
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