The PC is a 486 IBM compatible. I do have Windows 95' I had a power surge. After the power surge I received a DDO Integrity Error. After trying to Ctrl-Alt-Del several times. I would receive the same DDO Integrity Error. I then utilized a start up disk to boot up the system, afterwards, when typing C: at the A: prompt, I get the Invalid Drive Specification. I thought about FDisk to see if this would help. Are there any other options? Can you help me?