There are several ways to do it. My preferred way is to use "Security Settings Export/Import" feature. For export you need Acrobat. Import works in both Acrobat and Reader.
If you set up your personal Trusted Identities and signature appearances you may also need to copy addressbook.acrodata and appearances.acrodata (if you have it) from C:\Users\<yourID>\AppData\Roaming\Adobe\Acrobat\11.0\Security\ on your old machine to the same directory on your new machine.