Okay, fresh install of everything FSX related, I just got my key about 1 hour after emailing the request, I've installed, and uninstalled several times in the past mainly for general cleanup, and housekeeping. Now, I get an error that I never encountered...IPC Request Contains Bad Data (Obviously from Radar Contact, it starts when I go to start a flight plan)I'm running FSX with Acceleration, all up to date, windows 7 Home Premium, and definatly have the hardware, additional addons are:Ultimate Terrain, USA, and CanadaActive Sky XFeelthere ERJ 145Most up to date FSUIPC, (Non registered)Fs Passengers xDon't really want to uninstall and reinstall Radar Contact to repair, but am willing if that's the only fix, I've tried to run it in administrator mode, and get the same error.Any fix to this or a clean install?Thanks!Miklos

Problem solved, it was Kaspersky Antivirus still hanging around.Miklos

If you use Kapersky set RC as trusted. See the pinned topic at the forum head.