Google Free antivirus comes with Google pack. Google pack actually includes 3rd party softwares for computer protections.

Google pack was released in January, 2006. Google pack contains all basic softwares which users need in daily bases. Google pack includes Norton Security Scan and PC Tool’s Spyware Doctor for PC protection, Firefox with Google Toolbar and Google Toolbar for IE for better internet experience, Picasa photo organizer and Google photo screen saver, Star office for office documents, Real player, Adobe reader and Skype . This list may very from country to country.

At the time of Google pack release, Google was giving Norton Anti Virus 2005 Standard Edition for protection of system. This software was included with the six months of free virus database update. After that updates were not free. So Norton was not completely free as a part of Google pack at that time.

In March, 2007 Google included Norton Security Scan and PC Tool’s Spyware Doctor Standard Edition.

Norton Security Scan is completely free software provided by Google through Google pack. Norton Security Scan can detect viruses and remove them. Virus definition database is also updated automatically. It also has an ability to detect Spyware and Adware on your system. You can schedule your computer scanning with Norton Security Scan. The only thing I dislike about Norton Security Scan is that it’s not providing real time protection. Every time you will have to manually scan your system or schedule it. For getting real time protection you will have to upgrade software to a paid version.

Spyware Doctor is a good tool provides system protection against Spyware and Adware. It also update virus definition database automatically. It provides real time protection through File Guard. Here also for using Browser Guard, Network Guard and Process Guard real time protection, you will have to upgrade to paid version.

Overall Google provides good free anti virus software and anti spyware tool. Since it’s free, it’s definitely lacking of some features but it’s worth to give it a try.