I have been using a tool on my xp machine for some time. Recently, when I started this tool, I suddenly got the message "the feature you are trying to use is on a cd...". By clicking 'cancel' 3 times I was able to continue using this tool. Never found the reason or solution. Today, when opening a specific form in access (win2k, office2k) on another machine, I got the same error. Again, clicking 'cancel' 3 times got me to the form view. Since this behaviour now affected 2 machines, I decided to tackle the problem. Solution : download the windows installer cleanup tool ( http://support.microsoft.com/default.aspx?scid=kb;en-us;290301 ). Simply select the software that is stated in the error message and remove it. Done this on both machines and all works well now. Use it at own risk. Good luck.