The latest malicious software currently making the rounds is a recycled variant of the “FBI Virus” It locks down your computer so it will do nothing except display an official looking message “Illegal content has been found on your computer. Your computer has been locked by the FBI and the lock will not be removed until you pay a $100.00 fine”. Of course there is a link to pay your “fine”.
This virus is typically transmitted by email. Make sure your anti-virus program has access to scan your incoming email. Do not open email from people you don’t know, and be very careful when opening email attachments. It is best to right click on the attachment and have your anti-virus program scan it before opening any attachment.