My computer came with windows 7 and I got a free upgrade to 8 and everything has been good up until 2 weeks ago.....the computer won't boot. It tells me there's a problem and that it's collecting data and will restart automatically and also has the code 0xc000021a. I can't get it to boot into safe mode and I also can't get past the error screen it just keeps trying to boot up. What can I do
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