[ubuntu] 12.04 Installing Packages problem

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http://ubuntuforums.org – Hi all, I just downloaded 12.04 in my machine. And in the Ubuntu Software Center, on the tab for Downloads, I see "Installing Packages" (see attachment). This has been there for a very long time (more than a day). I don't see the normal cancel button on the side which I can use to cancel this download. As a result of this, I cannot download other applications. It looks like the first one must finish before it proceeds to subsequent downloads. Could anyone please help me remove this "installing packages" and fix the problem? Thanks a ton! (Hardware)