Crowdstrike is an app that corporate administrators install on workstations. This only affects windows machines that have crowdstrike installed. If you had the computer turned off after before crowdstrike updated and then turned on after crowdstrike had stopped deploying the updates, then you are ok. In dos commands, the path and filenames are case-insensitive. del c:\windows\system32\drivers\crowdstrike\c-0000029*.sys