Have you tried searching the hard drive for the missing file name?..If the file is actually on the computer, you may need to move a copy of the file to a different folder..If it's entirely gone, then you should be able to extract it from the C\Windows\Cabs folders.
Have you tried checking the D-Link sites below?
Hope this helps.
I did the software install,installed the card. Computer ask's for 98 se disk, won't install needed file, then say's it's missing rpcltc5.dll file,and said it was missing a dhcpcsvc.dll file at one time. I have an older dell optiplex w/98se<-has ethernet card , and 2 compaq laptops, one has ME, the other has XP Home.
The CTX desktop with a clean install of 98 se a few yrs. back.<-- trying to install pci d-link DFE-530tx+ fast ethernet adapter.