I have a brand new toshiba 2014 and I got a bad driver error

Feb 19, 2015
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How do I get the original operating system back on my computer 8.1 first it said not bootable restart your computer.I fixed that now when it's starting Windows I get the repair or start Windows normally screen,I select repair (recommended) and it says bad driver.It's to new to do a recovery on what do I do