Of course, once you have your shiny new ribbons in place, you will want to remove the add ins menu item.
The easiest way to do o is to make a copy of your MDB without the command bars in 2003 then use that in 2007.
If that's not possible/desirable you MAY be able to right click on each addin toolbar and delete it. Failing that untick add ins in the customise toolbars area of Access options ....but that won't remove it permanently