Allan I checked with Google Diagnostic page and it says no Malware in last 90 days. I have just been getting the warning on my MacBook (which has no security, usually all malware is Windows based; one of the reasons for using Mac OS ! ) that was previously OK. I get the warning on hospital system, would think they have some hefty system; and home PC , will check when back next week.
Its winter school hols here, skifield is -4 and snowing. So will go for a ride out of sunny Christchurch to show the lad Eyrie and Tram roads where Wright/Burns, Munro and Britten speed records were run.