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Tokitaumelie's post in FlightBeam KDEN cant register. was marked as the answerHave you tried registering with your AV turned off?
From memory, I think there were some files that you will need to exclude from your AV's On-Access-Scanning, namely, couatl.exe and I believe, bglmanx.dll in your root Sim folder.
Hope this helps
The quote is from the Support Website