You could check this - go to the App Drawer, find 'Downloads' and select it, then in both the Internet downloads and Other downloads tabs, select all of the items (that you don't need) and remove them.
If that doesn't help go to Settings -> Application manager -> ALL, scroll to the bottom of the list and make sure that there aren't any items listed as 'Disabled' (unless you specifically disabled them and are sure they don't have anything to do with the current issue).
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