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Okay, so I downloaded this DOSbox thing which:

a) won't go full-screen

and

B) runs Constructor (the only game I want to play in the WHOLE WORLD) unplayably slowly

So then I downloaded this other thing to boot up from a floppy, but when I tried booting up from the floppy it said "invalid directory" and went to A:\

Any ideas? All I want to do is play Constructor!