I've used the AdAware professional and was disappointed with its performance. We currently use both AdAware and Spybot to ensure the removal of all files. In comparison, if AdAware removes 6 entries, Spybot will find 10+ that were missed.

As for editing the security settings, that can't be done in some corporate environments. Our users have a myriad of tasks that must be completed and although we can restrict some to the intranet, that user group is limited to a handful.