OK thanks guys. At home sick today, and the little darlings seem to be working again
If we had a virus on the network at work all hell would have broken lose, several IT people would have been lynched, the main servers in Paris would have melted, and the word 'Merde' hear many times over.
Can't imagine what the problem was, but it seems to have vanished as mysteriously as it appeared. At least I have learned how to spell the word snilies.