Cloudstrike took town Internet. It is not a joke.
If you/your org is affected, here is the fix
Boot Windows into Safe Mode or the Windows Recovery Environment
Navigate to the C:\Windows\System32\drivers\CrowdStrike directory
Locate the file matching “C-00000291*.sys”, and delete it.
Boot the host normally.
Now, if windows are protected with Bitlocker and your don't have key - you are SOL.