This parasitic resident virus infects COM files being executed. The virus counts programs being executed on an infected system. When the counter exceeds 256 the virus makes the hard disk unbootable by placing an infinite loop to the MBR code.
Once detected, the F-Secure security product will automatically disinfect the suspect file by either deleting it or renaming it.
Detailed instructions for F-Secure security products are available in the documentation found in the Downloads section of our Home - Global site.
You may also refer to the Knowledge Base on the F-Secure Community site for further assistance.