Macro Disabled Error

I am creating a spreadsheet of which I only use the macros in. I send this out to a lot of people who's default macro security setting is High (disabled) and when they go to put information in, even though it's not trying to run a macro, whenever they hit enter it informs them that macros are disabled. Anyone know how to turn this off? I have no standing macros in the worksheet the occur whenever a change is done on a worksheet so I don't know why it's trying to do anything with a macro when all they're doing is putting some info into a field and using the enter key to move to the next field.

Thanks,

Janos