Thank you for your reply, really appreciated!
As I also have the issue that when I click Start Button nothing happen, I searched for help and got the fix before I shut down the computer yesterday. Now seeing your reply and I tried the Excel again, it's all working fine now.
Since it's working fine now, I have to assume, in my case, the issue is related to the DWORD (32-bit) value is missing in the HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced.
If anyone has the same issue as me, including the start button not working, you can try below as it works for me:
http://www.kapilarya.com/fix-start-button-not-working-in-windows-10
Kind regards,
Tracy