Can't delete, download, or update apps on Samsung Galaxy

Ever since my power button stopped working my Samsung Galaxy s2 has been having problems with my apps. I can't delete existing apps or download or update any either. When I try to delete or update it shows the loading bar but it never completes the action. I'd leave it on for hours and it never completes. How do I fix this? Also if you can help me find out a way to be able to turn my phone on and off completely without the power button I would appreciate it.

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