Many of the city's current flood defences are about 50-years-old after being built in response to the River Exe bursting its banks in October 1960.

BBC: Exeter flood defence improvement works to start in 2014

The malware is known by a number of names and is contained in the setup.exe and autorun.ini files.

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People living near the proposed farm by the Exe Estuary in Devon said they were worried about noise, smells and the extra traffic if the scheme went ahead.

BBC: Devon pig farm plan worries residents

Look for a line in the file containing mscdex.exe and delete everything up to it, so that the line begins with mscdex.exe. (You can remove all subsequent lines from the file, too.) Save the file.

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The Exe suffered major flooding in November and December.

BBC: Exeter flood defence improvement works to start in 2014