Norton Security Scan a free on demand scanner and malware removal tool that detects viruses using Symantec virus definitions.

Norton Security Scan scans the PC on demand and deletes the viruses, spyware and others affecting the security of the system. The virus definitions get automatically updated when online and other updates also come through online. Details of the most recent scan can be seen on the Results summary tab.
This is only a utility tool can be used as substitute for continuous, real-time protection from the latest security risks

Norton Security Scan Requirements :

Processor: 1.4 GHz and above
RAM: 1GB of Physical RAM and 256 MB virtual RAM on Windows preinstallation operating system
HTA Package installed