Thank you both. Which free firewall would you use? I have read Zonealarm slows pc/internet down and Commodo free internet security (firewall and antivirus) has so many pop up alerts that it has put people of using it.
Yes, I use Avast free as antivirus. However, I have read that latest version free Commodo internet security does not slow down computers the way older versions did. I'll uninstall PC Tools and Avast and give Commodo a go.