Did the excersice of adding the 256 RAM memory cause something? I have gone into device manager and deleted the Standard Floopy Disk Controller (both) and restarted the computer. The computer did re-install and still same issue. I am hesitant to open the machine to see if a cable became loose while installing the Memory. I would suspect if that was the case, the PC would not have been able to re-iinstall the floppy disk controller..