If you are referring to Flash updater check that you either have it in your applications folder or bottom row in your systems preferences.
If so then right click the dock icon and choose remove from dock.
Sorry see you said menu bar, just drag to desktop, Command-click the item you want to remove and drag it out of the menu bar. When you release the item it will disappear in a puff of smoke.
1) Click on the Updater icon and select "Open Updater." This will open a new window on your screen.
2) Select the "Preferences" option in the window.
3) Click the "Notify Me of New Updates in the Menu Bar" option to un-select it.
4) Click the "Done" button to exit the updater. The icon should now remove itself from your menu bar.
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