There are 2 ways to find if your OS is patched:

Do a scan at Microsoft update (custom / express)..

Or use PSI by secunia.com......





Comment.
Passed simple and advanced modes of Secunia with a couple of fixes on Winzip/Winrar/Winamp/Yahoo/Java.
Have got all latest updates from Microsoft that is possible for what i have.

Now i feel so much better.
Just as secure as i can be and still not spending a cent since 1999.