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.
The FBI has pressed charges against a Russian man who they believe is behind the malicious software which wiped out millions of dollars from its victims around the world.
The alleged administrator is Evgeniy Bogachev, 30, from Anapa in Russia, who the FBI suspects is leading a tightly knit gang of cyber criminals based in Russia and Ukraine that is responsible for the development and operation of both the GameOver Zeus and Cryptolocker schemes.
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.