The UK has a "two week period" to protect itself from a major computer virus that could give hackers access to sensitive information - costing the country millions of pounds, the National Crime Agency has said.
A small business owner from Birkenhead lost £100,000 "in three minutes" after one his employees unwittingly opened an email infected with the Zeus virus.
Jonathan Kemp, who runs varnish producer AEV Ltd, told Good Morning Britain their accounts manager opened an email claiming to be from HMRC on the same day cooperation tax was due before entering in confidential banking information.
Computer users are constantly being told to change passwords and update software due to the latest "Trojan" or "Bot" - but what are they?
The malware, called GOZeuS is hiding within email attachments, and once downloaded will enable hackers to mine infected computers.