I was using to Laptop i saw that the Volume didnt work so restarted the computer. it was taking forever to restart so i press

joesklar

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Sep 17, 2013
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It was probably configuring updates and it's been interrupted so the installation has become damaged.

Hold F9 during start-up and you should get the Repair Options, when you do you will most likely have to do a refresh install, which will keep your data but remove all of your applications.

System restore may work also, but it's unlikely.

Best of luck

Keep us posted.