What is the scheduled task "\Microsoft\Windows\CertificateServicesClient\SystemTask" on my Windows 8 computer?

"\Microsoft\Windows\CertificateServicesClient\SystemTask" is a scheduled task on Windows 8 system added as part of Windows installation.

You will see "\Microsoft\Windows\CertificateServicesClient\SystemTask" listed on Task Scheduler with the following information:

Name: SystemTask
Location: \Microsoft\Windows\CertificateServicesClient
Description: Certificate Services Client automatically manages 
   digital identities such as Certificates, Keys and Credentials for 
   the users and the machine, enabling enrollment, roaming and other services.
Actions: Custom handler
Triggers: At system startup, ...
History:
   Information 6:39:33 Task completed
   Information 6:39:33 Action completed
   Information 6:39:33 Action started
   Information 6:39:33 Task started
   Information 6:39:33 Created task process
   Information 6:39:33 Task triggered by computer startup
   ...

"SystemTask" is scheduled to run at system startup time.

It is recommended to keep "\Microsoft\Windows\CertificateServicesClient\SystemTask" enabled as a scheduled task.

⇒System Scheduled Tasks on Windows 8

⇒⇒Windows 8 Scheduled Tasks