“When you rip a CD with Windows Media Player does the original file on the CD get deleted?”
The contents of most CD media is read-only, which means your computer or CD player can see the contents and play them back, but cannot change the CD contents or delete them.
This means that short of scratching the CD or physically damaging it in some other way, you can’t lose the contents of the CD. Ripping a CD doesn’t ruin it, it makes a copy of the files on the CD, in a format that will be compatible with the software used to make the copy. Ripping a CD with Windows Media Player (or iTunes or any other CD ripper) makes a copy of the contents of the CD in a different file format, without changing the contents of the CD.