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

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