If you are looking for a new free antivirus for your system, you should give a try to "Panda Cloud Antivirus" which is absolutely free and light-weighted antivirus.
"Panda Cloud Antivirus" is based on new cloud computing concept in which services are provided over Internet. This new antivirus scans files through Internet which makes it very light on system resources. It also doesn't need regular updating of virus definitions as it automatically updates the virus definitions in the cloud (remote server) and scans your files using those latest virus definitions.
You should have a good speed Internet connection to fully utilize this new cloud based antivirus otherwise it won't work. Don't worry, if you are offline, it'll still protect your system from virus attack as it stores the virus definitions in local cache as well.

Version 1.1 has been released which can be downloaded using following link:
It can be used in Windows XP, Vista and 7. Both 32-bit and 64-bit Windows versions are supported.
This article was posted in Security Zone, Software Zone.
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Maahir
prevx is even lighter (less than 1mb) scans files and removes unsafe files.
VM
Panda Cloud Antivirus may be useful to notebooks or gaming computers that the resources are precious. Although i think that cloud antivirus won't be so good as a firewall :/
Robero
Thanks VG,much appreciated.Cheers mate!
Joji
Are you sure it's a good software? 'Cause my full version of ESET NOD32 epic failed to find the 40 hidden viruses in my laptop!!!
I used "Malwarebyte" to detect all those viruses... very effective.
In addition, Ad-aware free version fails too. After scanning, it freezes. O_O
Other than that, I found this great site which gives people free giveaways every single day! Check this site out: http://www.giveawayoftheday.com/
~Joji~
Joji
The only crappy thing about Panda Cloud, is that you have to unistall any previous "very known" anti-virus softwares in your computers.
"Very known" as in ESET, AVG, PC Tools, Onecare, Bit Defender, etc.
But you don't have to unistall not-very-known ones like Malwarebyte because it doesn't detect it.
~Joji~
Uewd
Version 1.1 is released!