Outlook 2013 stuck on Loading user profile.

If you can’t access Outlook 2013 to disable hardware acceleration, create the DisableHardwareAcceleration registry subkey. To do this, follow these steps:

1. Exit all instances of Office applications (for example, Office 365, Outlook, and Lync Online).
2. Start Registry Editor.
3. Create the following registry value:
   Subkey: HKEY_CURRENT_USERSoftwareMicrosoftOffice15.0CommonGraphics
   DWORD: DisableHardwareAcceleration
   Value: 1
   http://support.microsoft.com/kb/2761977