Spot on Peter. I have restored them from recycle bin and followed your
instruction.
Unregister all of them then delete.Just one stubborn dll stayed behind
as a lesson to me.

Thank you very much again.
Very Kind Regards


I'm not 100% sure but I think if you make identical test dll's (particularly
any public routines in public classes) in same original folders, then
un-register them that would clean up any stray entries in your registry.