When you have any system that allows the user to change any aspects of it there are bound to be holes. It is up to you as the end user to make sure that the changes that you are making does not lead to security problems down the line.
Why Learning How To Reverse Engineer Apple Products Is A Good Idea For Your Computer Security Career
If you want to make sure your network is protected to its maximum abilities then you might want to think about moving to the new Windows 8 system. But if you think that your network is fine and it is up to speed when it comes to security then you might want to wait until the next version of Windows comes out.