Can't launch Horizon?

I am having an issue launching the Horizon program. I keep getting a message that Horizon has stopped working and Windows is looking for an issue to solve the problem. My OS is Windows 8.1. I have tried to disable AV numerous times and boot up the program as an Administrator with no luck. I also tried restarting my computer normally and relaunching the program. I finally tried to launch Horizon by restarting my computer with safe mode but still the same result occurs with the “Horizon has stopped working” message. Is there anything else I can possibly do or is my pc just unable to run it?

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Have you installed .net framework 3.5?

I have installed Framework 3.5, 5 times, and still no luck. Don’t really know if there is anything else I can possibly do at this point.