You don't need to rip MP3 CDs. Unlike audio CDs, MP3 CDs are just plain old data CDs. You can simply use Windows Explorer to browse to your CD drive, open it and copy the MP3 files over to your computer's hard drive.
To run Explorer, click on the Windows Start menu, select Run and type in "Explorer".
Shortcut: if your keyboard has the Microsoft Windows key, hold it down and press E to bring up Explorer.