How To Remove Add-in Icons From the 2007 Excel Ribbon

In order to remove Add-in icons from the 2007 Excel ribbon you need to delete or rename the xlb file

1. Got to C:\Users\%UserProfile%\AppData\Roaming in Windows 7 or to  C:\Documents and Settings\%UserProfile%\Application Data in Windows XP
2. Locate the file Excel12.xlb and rename it
3. By deleting or renaming this file Excel will create a new one
4. Run again Excel and the options should be there

Deleting the file or renaming will do no harm to your system
Excel will create a new file for you. (You lost only your customization)
If you make your own toolbars or add buttons to the others this file is important (backup it so you can restore it)