If Windows 8 hangs frequently the reasons could be many, and therefore the solutions many too! There are some generic troubleshooting steps you may carry out to fix Windows hangs or freezes issues. But if you are running Windows 7 or Windows Server 2008 R2 and you find that when you start your computer, your computer stops responding durin the logon process then this article may interest you.
At this juncture you may find that your mouse pointer blue swirling animation continues for ever.
This could happen if the Winlogon.exe process has become unresponsive due to a possible deadlock being caused conflict between the Windows Event Log service and the Event.
If you are facing this situation frequently, visit KB2578159 and request for a hotfix.