At this point you could try a USB mouse and Keyboard to see if it will work (It may as they have different drivers).
But, I think the Registry is courrupted. I do not know what proceedure you used to clear the Upper/Lower filters for you CD-Rom
, but obviously it did not work.
You could also try a REPAIR Install, but I have a feeling you will NOT beable to have access to the Keyboard or Mouse:
http://www.michaelstevenstech.com/XPrepairinstall.htm
Other than this (If the repair does not work) you may have to do a complete CLEAN Install:
http://www.michaelstevenstech.com/cleanxpinstall.html.
In either case you still may retrieve your personal data by slaving the HD to a working PC BEFORE you do anything.
Bill