I have to be honest, I don't really know the solution but as the pc boffs in here haven't offered any suggestions I would be tempted to try either...
Going into 'Tools Menu' (in IE) 'Internet Options' 'Advanced' then hit restore defaults. Or reinstalling IE 6.
I don't know if that will solve the problem but it's worth a try. Personaly I always use the default settings in IE and never have a problem.
Best of Luck
T