Also, just in case you do click, have up-to-date antivirus installed to prevent the malware from installing itself onto the PC and taking it over.

FORBES: Ransomware Worm Spreading Via Skype

That lead was built by the more than 4, 500 DocuColor 2000 series printers installed to date, compared with probably fewer than a couple of hundred or so NexPress systems.

FORBES: Readers Say

Figures gathered by the Get Safe Online campaign suggest that 50% of PCs in the UK do not have up-to-date anti-malware software installed.

BBC: Microsoft launches free security