I recently had to reinstall Windows (not reformat) and in doing so, lost my MSN "Butterfly", but more importantly when I try to Defrag, I get the "Disk Full, Clear Disk". My computer says I have 83% system resources free (128 total RAM). When I Alt Ctrl Del, there is nothing running but Explorer. It also says after restarting Defrag several times "Another program is writing to this disk". For the life of me, I can't figure out what the problem is. I'm also getting a "Mprexe" error, but seem to be able to go on without it. Is all this connected?