I knocked my laptop off the desk last night. It worked fine until this morning. Microsoft Startup repair says the registry is corrupt. When I start my laptop, I get a blue screen with the following: STOP: c000021a {Fatal System Error} The intial session process or system process terminated unexpetedly with a status of 0x00000000 (0xc0000221 0x00100454) The system has been shut down. How do I fix this?

Have u tried to start in safe mode? Also might open back lids on laptop to see if ram sticks are secure and that hard drive is secure and still plugged in securely. Might try to boot using your system disk and repair, or might have to format and reload OS. vandal67

I can't get into safe mode. Microsoft doesn't start. I looked in the back and the hard drive is secure. Nothing looks or feels loose. I don't knowwhere the RAM sticks are. I don't have system disks, but I do have recovery disks that were made when I bought the laptop. If I use those will I lose everything on the laptop? Or has that aleady happened?

the ram sticks are in one of the compartments on the back of the laptop. you'll need a small phillips screwdriver to access them. take it or them out and reseat them. try the recovery disks. maybe they they have a repair option on them. vandal67