I'm using Panda Cloud Antivirus, it seems to work well.
When recently upgrading an HP Desktop machine to Windows 7 Enterprise, I came across both Panda Cloud Antivirus as well as SpeedFan 4.49
Well, I had to start over loading Windows 7, so I got Panda Cloud Antivirus on first thing, then I went to install SpeedFan 4.49
, but it was rejected by Panda Cloud Antivirus . . .
so I'm new to both Panda Cloud Antivirus (although it seems good, per the EE guy who recommended it). I also had SpeedFan 4.49 loaded earlier but some other nuisance virus on Firefox required a re-install of Windows 7 - everything seems good now (but I still have the fan revving up and such, and trying to adjust with SpeedFan).