videosoflife, Gibson Research is a free service that I have used for years. They do a decent job. You will probably want to scroll down to ShieldsUp and give that a try.
You will notice they have many other tests that you can try. You may want to check some of them out since they can be very helpful.
Here is the link
GRC | Gibson Research Corporation Home Page
After you spend some time at the Gibson Research site, you may then want to try Symantec Security Check. It is also free. Here is a link to it
Symantec Security Check