If you have not yet heard about the WannaCry ransomware worm that is wreaking havoc on PCs around the globe, we guess you are an Eastern mystic just aroused from weeks of deep meditation.
The malware that locks up data files on infected computers and demands Bitcoin payments for their safe release has lit up news sites as fast as it is shutting down computers.
There is plenty of good advice on offer about how to defend yourself, but one user group is at particular risk. If you are running Windows 7, it is time to take a close look at your machine.
Microsoft recognised the security hole that WannaCry exploits last March, and promptly released security bulletin MS17-010, explaining that there were flaws in its SMB network protocol.