Error codes 0x80070643 and 0x80070426 plus troubleshooter won't start

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asked Apr 11, 2016 by MDoug72 (120 points)
Please help me. I've tried opening the troubleshooter, but it won't start. When I try I get the error code 0x80070057. Also, I cannot open Windows Defender and when I try I get the error code 0x80070426. I then looked to see if there were any updates that needed installed. It finds the needed update, but then I get a message with an error code: Definition Update for Windows Defender KB2267602 Def. 1.217.908.0 error code 0x80070643. I would truly appreciate any help!
Additional Details Windows 10, ASUS X54C

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