What anti-virus are you using?
As a test, disable it and see what happens. If okay, re-enable it then disable the Windows Firewall and check it. Re-enable when done.
Also, I'd like to see what is installed on your computer if you don't mind. one way to do this is a follows:
Download and install CCleaner from the following link: CCleaner - Standard
During installation, uncheck the option to install the Yahoo toolbar.
Start CCleaner. Click on Tools (ICON) and Select the following BUTTONS to create two (2) text files:
* Uninstall > Save to text file (install) – bottom right corner of app window
* Startup > Save to text file (startup)
Locate and open each saved file in the ‘Documents’ FOLDER:
* Copy and paste the contents of each file into your next post (2 files).