This happened to me yesterday, well to my daughter computer. I have not found the answer to the problem, only a work around. The problem was caused by my wireless adaptor (TEW-424UB). A usb wireless adaptor by trendnet. I simply unplugged my adaptor went into safe mode, device manger, and disabled the wireless adaptor. restarted the computer. and it works, just no internet. Not a problem, my daughter only watches Taylor Swift videos. To start your computer in safe mode, turn the computer on, and hit "F8" until a windows boot menu appears.
Good Luck.