I'm using a Dell Dimension 2400 computer with Windows XP.  I have information saved on a CD/RW.  After updating the information on the CD, I attempt to save the changes.  I get a window that states "Access denied: you do not have rights to do this".  When I click "OK" it sends me to the "Save File-CD Drive G" window.  I seclect "Save In: CD Drive G".  When I Click save, I'm told the file already exists - Replace?  I select "Yes".  Again I get "Access Denied: you do not have rights to do this".  I'm also told the files on the CD are "Read Only".    In the past, I have been able to make changes to this CD/RW and save the changes with no problem.  Can you help me aleviate this problem.  Thanks