You might want to try doing a clean install of 9.1 . Sometimes, if you install over a previous version, or do an update, it still leaves remnants in the folder that might be problematic (ie corrupt, or things that might not be compatible). By doing a clean install, you isolate everything else, and will be able to see if it is an OS issue... another problem could be somehting underlying everything, such as hard drive probelms... have you run any disk utilities? Also, have you checked to see if there are any updated USB drivers for your floppy?
good luck,
dave