UPDTAE: Actually, I've discovered you can remove a digital ID (whose password you have forgotten) by deleting your old digital signature file (.pfx file). The loction of the .pfx file should be in the same default location as what you specified during creation of that digital signature (for example: C:\Documents and Settings\username\Application Data\Adobe\Acrobat\10.0\Security\). NOTE: The folder names / paths will be different based on operating system).