To erase files from a CD:
1. Open My Computer.
2. Double-click the CD recording drive. Windows displays the files and
folders located on the CD.
3. Under CD Writing Tasks, click Erase this CD-RW. Windows displays the CD
Writing Wizard.
4. Follow the instructions in the wizard to delete the files on the CD-RW.
How To Erase Files From a CD-RW Disc in Windows XP
http://support.microsoft.com/default.aspx?scid=kb;en-us;306641