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I have a Hp laptop and I just installed a Windows 10 in my laptop. I am a bit confused about which drivers to install in it. Can anyone suggest me which is the important drivers to install first.

I recently updated my laptop to windows 10 from windows 8 and had no problems for the first few days. However, now each time I log on, I have a window pop up with the following message: Critical Error Start menu and Cortana aren't working. We'll try to fix it the next time you log in. I have then logged out and back in multiple times and the same message has appeared, and yes before anyone asks I have tried turning it off and back on again. What should I do to fix this problem? Thanks for the help.