How do I delete a macro that I can't even find?

I wanted to assign hyperlinks to "picture objects" in a sheet. The hyperlink would be to a named location in the file. (user would click on a picture of a rabbit to go to the rabbit portion of the file, etc.)
I did this, but didn't like the result, so I deleted the picture object (and with it went the hyperlink, I hoped). I saved, closed and re-opened this file, and now it tells me there is a macro in the file. When I go to the menus Tools>Macro>Macros..., there is nothing there.
I don't know how this invisible macro got there. I have made similar hyperlinks in the past and not generated a macro inadvertently.
How do I get Excel to stop thinking this sheet has a macro?
p.s. I am sadly ignorant of macros in general, so if your response includes macro code, please also tell me where I can quickly learn the basics of the macro art.
Thanks a lot!