Just bumping this up at Judesman's request, to see if anyone has any ideas about this problem.
When I double click on the Google search bar I used to get a long list of previous searches. This has now vanished and any new searches are not appearing either. I haven't altered any settings or stored information so I don't know what has happened. The funny thing is that this list still appears in Alta Vista (Not that I ever use this search facility). Does anyone have any ideas please? Iam using XP.