I have had radar contact for almost a year running on MSXP. I have now upgraded to Windows 7. I installed RCv4 and now get a error 75 message FSUIPC rcv4. I have upgraded to the lateest FSUIPC for FS9. I tried running as Adm. but if I do it ask me for my key again. I'm very fruastrated at this point since I've upgraded over a week ago and have re-installed windows and everything else, but still cant't get rcv4 to run.