TS3772 why all of a sudden i need to download quicktime when its already working

why all of a sudden i need to download quicktime when its already working

Since you are running Lion, you will not see Exposé & Spaces - they don't exist in Lion.
Their function, that of multiple desktop arrangements, has been replaced by Mission Control.
You may have accidentally set up Mission Control; or inadvertantly activated it. The latter is easy to do if you're using a Magic Mouse - a two-finger double-tap (not click) on the mouse will engage Mission Control.
The two-finger double-tap can be deactivated in System Preferences > Mouse > More Gestures. Uncheck the Mission Control item, and it won't respond that way to a two-finger double-tap again. You can then still access Mission Control via its icon in the Dock.
To get rid of extra desktops in Mission Control, activate Mission Control. Then hover the cursor over the desktop you'd like to remove; a circled-X will appear in one corner of that disktop - click it and that desktop will be removed. Any open program using that desktop will then be moved to another, yet-available desktop.
There is a control pane for Mission Control in System Preferences. Selecting that will allow you to make some settings re how Mission Control behaves, including the setting/clearing of a hot corner.

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