And FYI... I don't really recommend that you rely on the Windows firewall as your only firewall. The Windows firewall only blocks inbound connections, folks trying to connect to your machine. It does not scan, filter, or block outbound connections, so it, by itself, is not enough to secure your system (
http://www.pcworld.com/article/id,117380-page,1/article.html). If you have a virus on your PC which is collecting data and sending it to a 3rd party, the Windows firewall will not stop or alert you to that traffic.
I suggest that you (and everyone) use a firewall blocks both inbound and outbound connections. Symantec, Norton, and Mcafee, are some of the well known products which can be purchased, and some of the freebies are ZoneAlarm or Comodo's freebie.
reviews.cnet.com/4244-3667_7-0-1.html?query=firewall&tag=cat_1
www.download.com/3120-20_4-0.html?tag=fil&qt=firewall&sort=&operatingSystems=128&licenseType=49&fileSize=&ca=No matter what virus protection tools you use, they are only effective if the signature files are kept up to date, and you periodically run a full system scan. Most products will allow you to schedule both the update and scan. My system is configured to update daily and scan once per wk, off-hours.
Depending on your web-surfing habits, you should also run some sort of anti-spyware periodically. There are some good free products out there, but I don't think the free products will let you schedule the scan. I use, and recommend Adware (
www.adware.com), and periodically, manually run the scan. If you are the only user of the PC, and you stick to the common, large portal sites, ie... Yahoo, MSN, Google, I'd consider your risks to be low. If, however, you follow every link, open every attachment, d/l free screensavers, tickers, etc, or if you or other users of the PC spend time on the online gaming sites, I'd consider your risk to be high to very high. For example... my daughter uses my machine, and gets click-happy when she's looking for free games, ringtones, etc, and has inadvertently downloaded viruses and spyware on several occasions. But (knock on wood) to date, I've been able to catch and clean them up, before there was damage.
Keeping up on your firewall, antivirus and anti-spyware protection, will save you time, frustration, and potential data-loss in the future. If you don't, it's only a matter of time.
Just my .02,
Mitch