Go to your app drawer and select terminal emulator.
type in :
su
fix _ permissions
Let it run, when it's done, reboot.
Note : it usually takes about 30 seconds or so.
Also : you should check the md5 sums of your downloads to make sure they weren't corrupt. Don't download any files using 3g ,if possible use pc or wifi.
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Failing to prepare ,is like preparing to fail.
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