Seriously... to everyone who is encountering this issue.
PLEASE CHECK THE SETTINGS OF YOUR ANTIVIRUS even if you aren't using McAfee... and try to disable the real time data analysis. If the issue continues to occur, try to disable your antivirus BUT for security purpose turn off your internet connection.
Hope that it will help you.
Keep in mind that when your PC is connected to Internet your antivirus should always be activated... There are only a few cases for which you could disable temporarly your firewall.
That'd be interested to know with which antivirus and version of the antivirus it occurs.