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MattyK -

Unfortunately, the menubar is supposed to be translucent, not opauqe.

ceezy3000 -

You shouldn't have had to download anything to make your menubar opaque.
Go to System Preferences –> Desktop & Screen Saver and un-check (or check) the “Translucent Menu Bar” option and you can change it there.

Provided you had a graphics card that supported it being there in the first place...which I presume you did.

For example, my G5 tower w/ 64mb ram doesn't even support the translucent option so I never had to worry about it.
 
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