Complete protection from viruses,spams,threats,etc-free software .?

Well ,
After the expiry of my Norton Anti Virus 2009.I downloaded AVG 8.0 Free Anti Virus.
Although Windows Vista provides a Windows Defender,and after installing Microsoft Security Essentials-windows defender stopped working.
Now I am worried about my computer’s safety.
Should I download Anti – malware softwares like Spyware Doctor ?
Is my computer safe from viruses considering AVG 8.0 & Microsoft Security Essentials are working?
Today a lot of new viruses are developed,is my computer safe with these two anti-viruses loaded?
Please tell me anymore good Anti malwares and Anti-spy and Anti viruses which are free.Or please tell me how to get lisence keys of Norton or Mcafee.
Please help.I am confused and do not know much about computers.

Microsoft Security Essentials-

http://www.microsoft.com/security_essentials/default.aspx

Ranked as #2 overall

http://www.thewindowsclub.com/microsoft-security-essentials-ranked-no-2-out-of-25

More information from Microsoft Security-

http://www.microsoft.com/security/default.aspx

Malwarebytes from- http://www.malwarebytes.org/
instructions on use- http://www.udel.edu/topics/spyware/malwarebytes.html
video on use of- http://www.youtube.com/watch?v=XvbkBonKOQU

Superantispyware from- http://www.superantispyware.com/
instructions on use- http://superantispyware.com/support.html
video uses of- http://www.youtube.com/results?search_query=instructions+on+use+of+superantispyware&search_type=&aq=f

Use these three together to keep your computer safe and the best part they are free!
“`

Marius van Oers – Mcafee


Norton Antivirus 2011 - 1 User/3 Pc [Old Version]


Norton Antivirus 2011 – 1 User/3 Pc [Old Version]


$15.29


Norton Antivirus 2011 protects your PC against the latest viruses, spy-ware, and other threats

Norton Reputation Service instantly checks where files came from and how long they’ve been around to identify and stop new crime ware faster than other, less sophisticated security software.

Norton Protection System uses several overlapping layers of protection that work together to stop viruses, spy-w…


McAfee Total Protection 3 User 2010 [OLD VERSION]


McAfee Total Protection 3 User 2010 [OLD VERSION]


$9.85


Ultimate award-winning PC and online security for total peace of mind With the daily emergence of new and more sophisticated Internet threats that could disrupt your digital life you need more than a simple anti-virus program to protect yourself your computer and your family. You need feature-rich and simple-to-use McAfee Total Protection 2010 software.New 2010 Product Features Active Protect…