When I try to launch my downloaded apps, nothing happen.  What can I do to fix this?

When I try to launch my download apps, nothing happen.  It uses to work before.  What can I do to fix this?

Have you tried a Reset...
Press and hold the Sleep/Wake button and the Home button at the same time for at least ten seconds, until the Apple logo appears. Release the Buttons.
http://support.apple.com/kb/ht1430
Also, See Here...
Troubleshooting applications purchased from the App Store

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