Thanks Digerati--haven't got any further by trying to change anything in 'Services' but still trying.Have been at work today,same tomorrow but home on Friday so will have another go.Failing that will email Microsoft and see if they have any clues.After that will try Canon to see what they say about driver for new scanner for Windows 7. They must have an answer,even MS says on one of their help pages that it should work. Cheers for now.