Law enforcement agencies in 11 countries - including Europol, the FBI and the UK's National Cyber Crime Unit - have disrupted the operation of a cybercrime gang which is responsible for the theft of hundreds of millions of pounds globally using the Gameover Zeus malware network.

In the wake of Operation Tovar, the National Crime Agency in the UK issued a stark warning to update computers within the next two weeks or potentially face a "powerful computer attack" when - as is expected - Gameover comes back online.

But what is Gameover, is it as dangerous as the NCA would have you believe, and if so, how can I protect my computer?

In this video, IBTimes tech editor David Gilbert answers these questions.