Re: Computer help request.
Larry's right. There is nothing wrong with your system and it doesn't need reinstalling or anything drastic. Defragging the system drive often does this. You can be patient, and wait it out sometimes, and eventually it works through.
You don't say what you're using for defrag. If it's Norton, it is often possible to boot from the Norton startup disk and run the utilities like defrag in this mode. Then the "writing to system" error rarely appears. If you are using a system defrag, it may still be possible to boot up from a simple floppy and run the utilities.