Configure your PC for an addtional user account.
Look in your computer's Help documentation to learn how to set up additional user accounts. To locate this information:
- Click the Start Menu, and then click Help or Help and Support.
- Enter "new user" in the Search field.
- Press Return.
If you create multiple user accounts on one computer but want the same media to be available in iTunes for all users, see iTunes: How to share music between different accounts on a single computer.
Sorry for joining this discussion with a further question! I have posted a similar question. I av set up two user accounts for my wife and I. However how do avoid having to duplicate the music library in each users account if for example a CD is being ripped to one users library I cannot get it to automatically update in other library unless you duplicate (hence use up twice as much storage on PC).