Hi, I just completed a new build to run FSX, I reinstalled FSX (along with Acceleration), MyTrafficX, and Radar Contact v4.3, (with the latest FSUIPC), but every time I load RC with the aircraft parked at the gate and try to get weather or a clearance, I get an error message "run time error '75': RadarContact.fsuipc.rcv4code" and RC then closes. I am unable to make any other attempts to access the program, until I restart it. I run Vista Ultimate 64 bit now, could this be a problem? Whereas RC4 ran perfect on my XP 32 bit version. I made no other modifications to any other codes.SystemVista Ultimate 64 bit, Intel Core2 Duo E6850 3.4, 4Gb RAM, NVIDIA 8800GT 512Mb, LG226WTY 22" TFT (1680*1050),2 WD Raptors 150gb RAID 0, WD Caviar 500gb, CH Yoke, Pedals, Pro Throttle.

did you right mouse click the .exe, or the shortcut, and then click run as administrator?jd

Sorry I took so long to reply, went away for the holidays, and did not have a chance to try the suggested remedy. No I didn't right click on the shortcut and run as administrator, but as soon as I tried it, it worked perfectly. Thanks JD. Happy Holidays.