That’s definitely an antivirus or firewall interference for sure. We’ve seen that error message a lot of times and, 98% of the time, it’s an antivirus or firewall.
1% of the time is because you’re using Windows 7 and have an outdated .NET Framework package. The other 1% of the time it’s because of PC issues like permission problems or corrupted registries.
See here for troubleshooting: I can’t Install WeMod