The following articles should help with the removal of all Apple software from your system.
Followed the articles but it still detects an older version of Bonjour. When installing iTunes it comes back with the message " An older version of Bonjour is installed. Please contact your Technical Support". I have no idea where it is finding Bonjour since there is no record of Bonjour in the registry or any installed programs named Bonjour.
To make matters worse, Safari will not install at all due to this error.