Crowdstrike is a cybersecurity service, and it mostly protects endpoints. 

Furthermore, it protects large firms just like you run an anti-virus software to protect your computer. 

The "CSAgent.exe" and "CSAgent.sys" files in the latest update of their Falcon Sensor installer create a boot loop in Windows, which means that the "CSAgent.sys" driver does not boot into the system and shows a blue screen.