You should be able to install dbase IV strait in the DOS box i.e. command window from the disks.
Important: dbase probably doesn't like long file names, so be sure its folder is short, e.g. c:\dbase
You wont be able to just copy the floppies to a folder and run dbase; you have to install it. Tho you could do so as a intermediary step, and THEN run the install from that folder.
1. open the command prompt: start > run > type "cmd" > enter
2. in the black box: (hit enter after each)
a: install (or it could be setup)
That should start installing it.
Please try that and let me know
Of course DOS doesn't know about the USB port so printing might need some tweaking.
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P.S. I grew up on dBase for DOS!