Panda Cloud Antivirus is a unique entry in the free antivirus race. Most free antivirus products still rely on signature updates to detect new malware, but Panda's program instead uses fresh data about malware direct from Panda's servers. As a result, Cloud Antivirus put up some excellent results in some malware detection tests, but its scan speeds were slower than we would have liked to see.
Installation and setup for Cloud Antivirus is simple and straightforward: You have to click through only one screen before it starts installing, though I found that it asked to install a browser toolbar. Upon installation, it'll ask you whether you want to use the free or "pro" (for-pay) edition of Cloud Antivirus.
Panda Cloud Antivirus's main interface is really simple: The main window has only four tabs that run across the top--one for the status screen, plus tabs for the scanner, the
scan report, and the recycle bin (where neutralized files live--Cloud Antivirus lets you recover files in case it neutralizes something you wanted to keep). When you first open Cloud Antivirus, you're presented with a status indicator (a green checkmark if all is well, or a red X if something needs your attention) and a short description of your PC's protection status.
Source :http://www.pcworld.com