I've always liked Panda Antivirus and have used it at work for a good few year with great results.
So it was nice to see Panda Launch a new product. I think its time to give it a go. The have a blog detailing how the scanning works:
With Panda Cloud Antivirus we introduce a new protection model based on a thin-client agent & server architecture which services malware protection as opposed to locally installed products. By combining local detection technologies with cloud-scanning capabilities and applying non-intrusive interception techniques on the client architecture, Panda Cloud Antivirus provides some of the best protection with a lightweight antivirus thin-client agent that barely consumes any PC resources.
Panda Cloud Antivirus is the first antivirus based on this innovative protection model which is based on two fundamental principles:
1. Automatic malware detection and remediation from the cloud in real-time.
you can try it out free by clicking below
or Visit http://www.cloudantivirus.com/