I want to have the mcafee site advisor icon on my toolbar, but then why do my toolbar buttons disappear?

I like my Yahoo toolbar because it has my customized buttons, but I also want my mcafee site advisor to show, but I can't seem to have them both at the same time. How do I get all my yahoo toolbar buttons to show & also the mcafee site advisor? I know it's possible because they all showed at one time, but then I downloaded something & my toolbar buttons disappeared & I had to re-do my toolbar buttons again. I uninstalled what I had downloaded, but it didn't fix the problem. It's probably something really simple, but I'm getting frustrated because I can't figure out what it is. Please help.

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