Using more than one software firewall on a single computer is not advisable
Using two firewalls could cause issues with connectivity to the Internet or other unexpected behavior. Further, running multiple software firewalls can cause conflicts
that are hard to identify and troubleshoot. Only one of the firewalls can receive the packets over the network and process them. Sometimes you may even have a conflict that causes neither firewall to protect your connection. However, you can use a hardware firewall
) and a software firewall
(i.e. Kerio, ZoneAlarm, Comodo, etc) in conjunction.
You also may want to read Understanding and Using Firewalls
is no longer recommending
Spybot S&D or Ad-Aware due to poor testing results. See here
- (scroll down and read under Freeware Antispyware Products)
Ad-Aware has even been placed into the Installers Hall of Shame
for bundling and pre-checking Google Chrome during the installation. Also read Lavasoft Turning to the Dark Side?
writtne by a former volunteer (now a MVP) who provided support for Ad-Aware but no longer uses the program.
As for Spybot S&D, most people don't understand how to use TeaTimer
and that feature can cause more problems than it's worth. TeaTimer monitors changes to certain critical keys in Windows registry
but does not indicate if the change is normal or a modification made by a malware infection. The user must have an understanding of the registry
and how TeaTimer works in order to make informed decisions
to allow or deny the detected changes. If you don't have understanding how a particular security tool works, then you probably should not be using it. Additionally, TeaTimer may conflict with other security tools which do a much better job of protecting your computer and in some cases it will even prevent disinfection
of malware by those tools.
More effective alternatives are Malwarebytes Anti-Malware
and SUPERAntiSpyware Free