Antivirus free download:
http://antivirus-software.tech.officelive.com/the_best_free.aspx
1. Antivirus: Choose one - Microsoft Security Essentials (MSE), Avira, Avast, or PC Tools Antivirus. To get a free Avast download, go to the products tab, "Desktop Protection" - "Home Edition". MSE is a stand alone program, don't combine it with other antivirus or antispyware programs.
Generally speaking, a combination of two programs will give your PC a higher level of protection than a single program. A good combination is Avast or Avira antivirus and Iobit 360 antispyware. These programs are compatible and will work on any version ( 64 bit or 32 bit) of Windows - XP, Vista, or Windows 7.
2. Antispyware: Choose one - Spyware Doctor or Iobit 360. These provide real time monitoring and protection. I mentioned Malwarebytes in the video, but the free version no longer provides any real time monitoring. Spyware Doctor with antivirus is a stand-alone program, don't combine it with other anti-spyware or antivirus programs.
Spybot S&D also has a real time monitoring system, but we don't recommend it as a primary anti-spyware due to the fact that the Spybot Tea Timer can conflict with other security software on your PC and affect performance. This can slow down the computer significantly. Spybot Tea Timer also has a lot of pop-up warnings so we don't recommend installing it.
The free versions of SuperAntiSpyware, Malwarebytes, and Advanced System Protector are good secondary scanners and removal tools but provide no real time protection. Hitman Pro has the reputation of being a good virus and malware cleaning tool. The paid versions of all the software do provide real time protection, and can block malicious software from installing on your computer.