While I don't advise actually doing this because even the most caustious people WILL make a mistake eventually and SmartScreen is design to stop that I will go ahead and post the instructions to do this.
- Open up the classic control panel, and select the System and Security link
- Now select the Action Center option.
- Once you are in the Action Center expand the security list, and scroll down looking for the Windows SmartScreen option. Once you have found it click the change settings link.
- You will most likely be prompted by UAC to enter your password, now you can totally turn off the SmartScreen Filter. Change the radio button from the default to the bottom option.
How-To Geek -> How to Turn Off or Disable the SmartScreen Filter In Windows 8
Can I turn SmartScreen on or off? Yes. Here's how:
1.Open Internet Explorer.
2.Click the Safety button, point to SmartScreen Filter, and then click either Turn off SmartScreen Filter or Turn on SmartScreen Filter.
3.In the Microsoft SmartScreen Filter dialog box, click OK.