Norton 360 Antivirus is now installed and all files scanned. No viruses found.
Sorry, but Norton it's probably the worse offender when interfering with legit programs and causing false positives and errors like that. Best to use the free, reliable, easy to use and not interfering MS Security Essentials.
If really you want to use Norton (not suggested, it's slows down the system a lot), be sure you ALWAYS to the following when installing:
- TURN OFF your antivirus. Don't just exit from its interface, but turn off the real time protection. Actual wording changes between products, however, it's the option to scan every file that gets open in real time, without user intervention.
- Install Stand-Alone Addon Manager with the Antivirus TURNED OFF. Don't launch FSX yet.
- Configure the antivirus to exclude the following files from scanning:
YourFSXFolder it's usually C:\Program Files\Microsoft Games\Microsoft Flight Simulator X, if you installed it in the default folder.
- Now you can turn the antivirus back on, and launch FSX.