I haven't used my PC for awhile and I seem to have lost my keyboard & mouse function when I enter Windows XP.
The keyboard & mouse are connected via USB but they are not working.
Thanks for posting.
It sounds like your USB drivers have not completely installed. Be sure you are plugging your keyboard and mouse into the USB ports on the back side of the CPU and not the front.
If neither are working, you will need to uninstall the drivers and reinstall them.