Crowdstrike is a software used in many services running windows as an extra security tool. They have technologies to prevent all types of attacks. A lot of companies uses this software so if something goes wrong, like an update, can cause a huge outage like we are now seeing.

Microsoft is aware of the problems and the Crowdstrike Engineering team are trying to develop a fix for the issue. Currently is possible to apply a quick fix.

        Start Windows in Safe Mode. 
        Delete file C:\Windows\System32\drivers\Crowdstrike\C-00000291*.sys ( all starting with C-00000291... )
        Restart computer.

Displaying errors trying to get into safe mode or can't start in safe mode?

        Use Ubuntu with a pendrive, you can use Rufus software to create a Ubuntu bootable usb drive.
        Delete file C:\Windows\System32\drivers\Crowdstrike\C-00000291*.sys ( all starting with C-00000291... )

Temporary workaround for the problem. Use at your risk.