Need software recommendation

[delmarbd]

I had a trial offer with Norton Internet Security 2012 with my new ciputer which is now expired.  I was very hapy with it but can't pay up for the subscription. What is a good free software that I can download and replace it with.  Also, I guess I also need a separate firewall?

I have an HP and running Windows 7.  Runs great and don't want to fill it with junk.

Thx

[Geek-9pm]

To name just a few...
Alvira
AVG Anti-Virus Free Edition
Avast
ComboFix
Microsoft Security Essentials
Malwarebytes

Norton is given lower ratings. But it is not the worst.
Try a free one for awhile. Then try another.
Do NOT use two together, unless that is recommended.

[soybean]

Also, I guess I also need a separate firewall?

Windows, of course, has a firewall and I'm sure many users are using it. 

[delmarbd]

thx!