It is a massive problem about this!
It is only one thing to do, and it is very easy, just follow this guide:
1.Open Control Panel.
2.Open System and security ( Or something like that, it is the first one in the menu ).
3.On the left side, click on the Programs button.
4.Then click on the "Run programs made for previous versions of windows". ( It is on the top )
5.Click "Next > Find "WolfTeam" in the list > Pick the first one > Start the program > Next > And save.
Well, I hope this helped you, it helped me!
I have Windows 7 Build 7100.