Which anti virus is good for my hp pavilion g6 windows 7 home basic?

[sfombom]

my norton anti virus is expired i dont have a money to up date that.so plzzzzzzzz some on say to me which anti virus is good
avg free edition2012
avg anti virus professional 2012
avira antivir personal free antivirus
avg internet security 2012
and from where i should download this safe and free and can some one tell me how can i download free 3d themes for windows7
and for clean and fix my pc error what should i do can i chose one of this
pc tools antivirus free
remove it pro 4 se
norton power eraser
plzzzzzzz some one help me help

[patio]

My current package:

Microsoft Security Essentials
SuperAntiSpyware
Malwarebytes
Win Patrol

All free..and effective.

[reddevilggg]

I use Avast Anti-virus. It's free and I like it.

http://download.cnet.com/Avast-Free-Antivirus/3000-2239_4-10019223.html

I also use Anti-malware. Free.

http://download.cnet.com/Malwarebytes-Anti-Malware/3000-8022_4-10804572.html

and Super anti-spyware. Free

http://download.cnet.com/SuperAntiSpyware-Free-Edition/3000-8022_4-10523889.html

Also CCleaner. Free

http://download.cnet.com/ccleaner/

[maxum]

I always used Avast! free antivirus.