Run Techsupport.exe (located in your NS2 install directory) and attach the zip file it makes to your post. This gives us a log NS2 makes, possibly containing errors, as well as provide us with your system’s hardware and driver information so we can spot issues.
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Hi there, what version of Windows do you use?
Make sure you followed all steps of the tech support instruction post. Specially the part about the VC 2013 Redistributable Packages .
What happens if you run it from Steam, whats your Steam profile?