can someone please explain to me what an FSUIPC is, and what it does? i installed my FS2004, and it worked fine once or twice, then i installed 727 professional and everytime i opened FS2004, it said my FSUIPC was the wrong build or something, i uninstalled 727 pro. and uninstalled FS2004, and reinstalled/uninstalled it numerous times without 727 pro. and it still says my fsuipc is the wrong build. help, help, help.