 In a post on Reddit, CrowdStrike says it's investigating the cause of widespread issues on Windows devices. Those computers are caught in a boot loop in which the computer starts up but never logs in. It's related to a software update CrowdStrike recently sent out. As a workaround, CrowdStrike recommends starting your computer in safe mode, which can be done by holding down the shift key, pressing the power button, and then selecting restart. It then instructs users to delete the update file. Mike Dubosky, ABC News.