Mobile Flight Simulators

I had tried to load FSUIPC on a Windows 2000 Pro SP2 system running FS2004. I downloaded and installed FSUIPC.dll (version 3.99, April 11, 2011) and copied the PFC.dll file into the Modules folder for FS2004. When I start FS2004 I get the message, "Flight Simulator unable to load some aircraft or software. File: FSUIPC.dll". I have not yet been able to find a solution to the problem. I thought that there might be an older version of FSUIPC which might be compatible with W2000. Does anyone know of a download source for an older version of FSUIPC?

I have a PFC-142 PCATD using Elite GENVIEW V8.0. I am attempting to interface FS2004 to the PFC-142. FS2004 was chosen because the PC currently supporting the PI-142 does not meet the video requirements needed for FSX. The PC is an AMD Athelon running W2000 PRO service pack 4. I downloaded and installed FSUIPC.dll (v3.99) and copied PFC.dll (V2.307) into the Modules folder for FS2004. When I start FS2004 I get the message, "Flight Simulator unable to load some aircraft or software. File: FSUIPC.dll". There appears to be no other information to help diagnose the problem or determine the exact nature of the error. I sure could use some help!