I was surfing the web looking for a couple sights that might give me some insight into vulnerabilites associated with windows when I found this sight.

http://www.winguides.com/security/

I think that this is about one of the best websites that I've come across for Windows. It has everything from tips, and tricks, registry guides, software vulnerabilities, networking, just about eveything. It also has some free Window Tools there.

I highly recommend that you chek this website out.