open regedit and goto this key:
HKEY_LOCAL_MACHINESOFTWARE\LogMeIn\V5\Net\NATUDP
then change the key as shown from 0 to 1 by double clicking and changing the value


found from Steve Dyman's Online HomeNote: I ran across one situation where my computer did not have the DisableEx key listed in the registry. If this happens just create a new DWORD value and name it DisableEx and give it a value of 1.
http://sdykman.com/blog/logmein-activex-registry