As someone who works with Windows computers every day, it is my opinion that McAfee is the problem in this scenario. Consider getting rid of it and using a different anti-virus. Windows Defender is included with Windows 10 and it works well.

However, if you are serious about crypto-currencies, I highly recommend that you use an alternative operating system. Windows is so insecure, that I wouldn't feel comfortable having information about my crypto on it. It's not that the wallets are insecure, but if you keep notes or data about your crypto on the Windows system, it is vulnerable.

I highly recommend Linux. You can even run it on a Virtual Machine (like VirtualBox) from within Windows.