Windows 10 class not registered - how can i fix it?

Ch
3

My laptop has slowed down a few days ago. When I write text on Word, the computer often starts to hang and after a few seconds it goes back. In addition, I can't access the objects / apps in the task bar. Such as "Settings, Dropbox, Windows, Cortana" etc. It comes class not registered. I also can't click anything in the Windows menu - nothing opens.

Si

Start with USB windows boot stick and select computer repair

Ch

Are all data deleted?

Si

When repairing not. You have determined data backup. Otherwise save data with Linux live USB stick.

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