This should only be done by graduating students! If you will be a returning student and are away from campus, the IT department is unable to remotely add your machine back to the domain.
Click on the Start menu, and type control panel.
In the Control Panel select System.
Select the Change Settings next to the Computer Name field.
Press the Change… button
Select the Workgroup box and enter in WORKGROUP.
Select Okay, followed by Okay.
You will be prompted to restart your machine in order for the operation to complete
press Okay again to allow your machine to restart.