Methods to eliminate ripping music onto PC

Hello everyone. I have a Windows XP Professional computer that had some music ripped onto it and this shouldn't have been done. I honestly have no way of knowing if Windows Media Player was the program used except for the fact that it's the only software on the PC that can rip music and the files were (I believe) .wma files.

What I'm wondering is if there are any known good ways to keep this type of thing from happening. I'm certain the music was ripped from a CD. I know that it could just have easily been downloaded from the Internet or copied via a flash drive. I'm wondering if there might be a way to use Local Computer Policy to setup a policy not allowing ripping of CD's or something like that. Or if you know of any software to lock down a PC let me know that, too.

Unplug the power cable to the cd drive
disable the usb ports
rename WMP's exe file

Then for grins, inform the employee that they've violated the company's policy and your there to Prosecute them;)

There is no policy for that, at least I'm not aware of one.
If you think the music was ripped from a CD you should check your AutoPlay settings.
Open Explorer, rightclick your CD drive and select properties.
On the dropdown menu select Music CD and ensure that the "Rip music from CD" is not selected.