Hi. I received the following useful reply yesterday to a question about a very similsr problem:-
Try the system file checker start run sfc /scannow You will need the XP CD.
[I'm on Win XP Pro. When I click 'Start', then 'Help and Support' on the menu, I get nothing. Once (only) I got a message box saying something like 'can't be found - .dll missing'. Nor can I get to 'Help' via any other route. Recently, when doing a routine uninstall, I stupidly clicked 'Yes' when it said (roughly), ' ...... this is a shared file but is not being used by any other program. Do you want to delete' etc. Does anybody know if I can sort this problem out? Many thanks, Mike.]