can you help me with macro security?

i created an app in excel on my pc. i created a certificate on my pc. i
copied my app to the client's site. i have some gpo's in place to disable
the macro menu item and the protection menu item.

when i set the macro security to medium, i get the enable/disable macros
dialog. it shows my name but says the publisher has not been authenticated.

1. how do i get my certificate authenticated, because this message pops up
every time the spreadsheet is opened? the always trust macros option is
grayed out.

i can set security to low via gpo, but that is not recommended.

any help appreciated.



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Gary