Thanks Rob for the quick response
However... I have tried setting it at 'Search this user's files' and 'Search indexed locations', and 'restored defaults...' none of which restore it. it was there before I installed the Service Pack... When I use the 'classic' start menu', the search function is there and works...
A perplexing and diverting problem... perhaps i should uninstall the service pack to see if it returns?.
Martin