Firewall....

[gortle]

Your modem or router should already have firewalls.

Antivirus - Avira
antimalware - malware bytes

[CarlosinFL]

Your problem isn't a Firewall. You need to load good AV protection and monitor your children's PC activity if it's getting out of control. Another suggestion is to just get him an Apple Macbook which is hands down 100% more secure than any Windows O.S. Windows is the only O.S. plagued with viruses, trojans, and other malware. I strongly suggest you try something more secure or you will continuously have this problem with kids...trust me. Your home network will always be infected.

A good Firewall if you're looking for one...

Endian
IPCop
Smoothwall
Untangle

All of them being free but require dedicated hardware so break out those old Pentium 3 vanilla boxes and start sniffing packets.

[James.k93]

Avg and Ad-Aware are both reliable and useful

[PatHIverson]

The software mentioned above is good if you have a powerful computer. If you computer is a single processor you might want to try some software that is not resource intensive like, Avast-free or Nod32-free, etc...

[benjamin1greer]

That is what I suggested, Pushkins. Not exactly, but I did lean towards McAffee...

but mcaffee is not detect all malware

[mrcaptainbob]

Firewalls...

That is what I suggested, Pushkins. Not exactly, but I did lean towards McAffee...

[pushkins]

I use exclusively on three laptops and a stand alone PC ......McAfee Total Protection, it's easy to use, friendly for making changes, and plenty of warning settings.

[mrcaptainbob]

This is getting out of hand. Now my son's PC got so infected reloading software was the only fix. He will run FireFox when it's back up, but he also wants to know what is a good recommended firewall, anti spam...anti-everything safety to run. Any suggestions?