First off, if you have the Windows firewall or a standard SOHO router, you are not getting attacks directly from the outside, because either is very effective at blocking incoming attacks.
You have something already on your machine that is the issue.
Please follow the instructions
here (5 pages) and then post all the requested logs in a new thread
here for the security analysts to look at. If you have any trouble running any of the scans, leave them and move onto the next.
The security forum is always busy, so please be patient and you will receive a reply as soon as possible. If you go to Thread Tools > Subscribe at the top of your new thread you will receive an email as soon as a reply is posted.