An issue has been reported by several Windows 8 users that their system crashes and freezes on Windows 8 Startup.
There does not seem any apparent reason Windows 8 crashing, handing, or freezing at Startup. It could be cause of a number of reasons which is why no particular solution can be suggested. Here is a video featuring various tips you must try to cope up with the issue. Doing the tips mentioned in video will help you say Good-Bye to Startup Crashes.