I am running mountain lion 10.8 but my computer won't accept updates

as mentioned i am running mountain lion 10.8 but my computer wont accept updates to 10.8.1 or 10.8.2 there are yellow marks over the hard drive when i try to install/open the DMG.
WHAT DO I NEED TO DO TO CORRECT?

Open About This Mac from the Apple menu and check if you aren't alreay running 10.8.2. Otherwise, you are running a beta version.

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