Paradox for Windows Ver. 5.0 Error Message

I keep getting an error message when I try to do a few different things.  If I
click on the Data Model Icon or when I click to define a field object to link
tables I get the error message "Pdoxwin perfromed and illegal operation and
will shut down"  when I click on the details I see "nwcalls.dll" caused this
error.

Can anybody help me out there?

Thanks
Mark

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