But when you use DD disks it is strange that your PC reports a bluescreen when writing to them !?!?
Did you format them correctly to 720kB ? Also don't forget to check the 'full format' box when formatting them from Windows, because otherwise they will just get quick-formatted, which basically is a directory deletion
Maybe also your PC's diskdrive is a crappy one which cannot get along with 720k DD disks ?