For home users the best, and problem free 
And if you need more control you can use this to control Winfirewall http://tinywall.pados.hu
Your on a Win7 system so as others mentioned already the Windows Firewall is very good, you can add extra control with some of the windows firewall add-on programs such as what Pondus linked though they are not automated, If you’d still prefer to stick with a free third party automated firewall then there is Comodo, OnlineArmor or Privatefirewall… the best paid Firewall imo is Outpost Firewall.
craig, i got rid of pc tools fw plus. i tjhink(hope) it turned my WINDOWs FW on automatically.
in any,case my security pg looks better and AVAST is running smoother without pc tools fw.
i just hope my pc is safe.
its probably quicker
You can check the action centre to see if the firewall is on, click on the little flag icon bottom right in your taskbar - open action centre - and click the drop down for security, firewall and AV should be listed there as on if all is good.
with more than one similar posts, i dont know if Im always replying to the correct people.
now that i’vre figured out how to uionstall in safe mode, maybe i will do that to re-install iTunes, because it won’t uninstall the reg way