I am unable to update my window as it kept on loading for 30mins and nothing came out. And when I did the troubleshooting, but there is no respond for 2 hours. 

Hello,

Please run the Windows Update Automated Troubleshooter and let us know what it reported you back:

http://go.microsoft.com/fwlink/?linkid=260622

Hope this helps, Good luck :)

Hi,

Please try the steps in this FAQ, for further troubleshooting, please post back the %windir%\windowsupdate.log here for your research.

[Forum FAQ] Common steps to start troubleshooting Windows Update issues

http://social.technet.microsoft.com/Forums/en-US/c842b997-42a4-41fb-9992-b58d65d068d9/forum-faq-common-steps-to-start-troubleshooting-windows-update-issues?forum=w8itprogeneral