MalwareBytes - Anti Malware Software

Malwarebytes Anti-Malware is a surprisingly effective freeware antimalware tool. It's a relatively speedy malware remover, with the quick scan taking about 8 minutes even with other high-resource programs running. The heuristics engine proved on multiple computers during empirical testing that it was capable of determining the difference between false positives and dangerous apps.

Download from: http://download.cnet.com/Malwarebytes-Anti-Malware/3000-8022_4-10804572.html

You may need to save onto desktop as 55440.exe file and then run from there and you may need to run as administrator, if your machine is already infected).

Cloud Antivirus

Panda Cloud Antivirus is cloud-based. It consists of a lightweight antivirus agent that is connected in real-time to PandaLabs' online Collective Intelligence servers to protect faster against the newest malware variants while barely impacting PC performance.

Despite still lacking some of the deeper customization heft that other free antivirus solutions have, most glaringly a scheduler, the program is not necessarily a bad choice for a stripped-down antivirus. It has added a full on-demand scan, and it runs at around 15MB of RAM when idle and around 60MB when scanning. It's a great choice for resource-conscious Netbook users. Panda Cloud Antivirus makes a decent, reasonable security choice for anybody looking to effectively balance security and system performance.

Download from here: http://www.cloudantivirus.com/en/