Turn on the computer and open up the CD drive. Place a CD-RW disk onto the tray and close the drive. Wait for the computer to recognize the disc.
Open up a CD burning and ripping application. If you do not already have a program capable of writing, deleting and rewriting files onto a CD-RW, then download and install a program like Nero InCD, Roxio Creator, or Windows Media Player.
Add files to your CD-RW. Import audio, video or data files into the CD burning application using the program's "Open" or "Import" menu. Use the "Preferences" or "Options" menu to make sure the "Multi-Session Disc" feature is enabled. Arrange the order of the files as you see fit and click the "Burn" or "Start" button to begin the burning process. Wait for the files to completely finish burning before ejecting the disc.
Delete files from your CD-RW. If you wish to completely erase all files from the disc, right-click the CD icon on your computer and select "Erase," "Erase All Files on Disc," or words to this effect. If you wish delete individual files from the dick, use the software burning application to drag the individual "session" files off of the CD-RW.
Rewrite files to the CD-RW. Use the CD burning application to write new files onto the disc or to replace old files that you no longer need. Import the new files into the burning program and select the "Multi-Session Disc" option before starting the burning process.