Did you:

1. Download the installer (csp131_1300.exe) with your AV off/disabled?
2. Install the C-130 X-perience (FSX) with your AV off/disabled, and using the "Run as administrator" option (right click on the installer and select "Run as administrator")?

If you didn't, try reinstalling it as an administrator (#2). If that doesn't work, download the installer again (*#1), then reinstall the C-130 X-perience.
Hopefully that will fix it.

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