What monitor program are you using? Maybe we can recommend an alternative program....
It sounds like the programs default diricotry is A: but instead of searching for A: drive and than asking you to select another dirictory when the program realises its unavilable, its just freezing. are there any .ini files with the .exe that maybe specify the default settings (long shot lol) or map a network dirictory/cdrom/partion as A: to trick the program, otherwise you may have to use the program on a computer with a floppy.