If you want to copy the whole CD then if you have some disk creation software on your PC then this will probably allow you to do a full CD to CD copy.
If you just want to put some files on the new CD then put the master CD in the computer, open a Windows Explorer view of the contents of the CD, then select the files or folders you want to copy and then either use drag and drop or copy and paste to copy them to your hard disk. Put them in the My Documents folder.
Then put a blank CD in the drive and use any disk burning software you have, or use Windows Media Player, to burn a new CD with the folders or files you want on it.