http://www.grc.com/ is an excellent site for securing Windows. You do not even need to install the software, you can open it from it's location and all the applications are tiny.

The man who built this site and all the utilities is a friend of my friend. I posted a link to this site back in December in one of the multitudes of other similar threads to this one. I always recommend it because it is free, it is informative and you need not install anything on your computer.

Use it, it works!