Resolution steps:
- Open Command Prompt as Administrator
- Type regedit then press Enter
- Locate Computer\HKEY_CURRENT_USER\Software\Microsoft\Office\14.0\Outlook\Security then double-click on "OutlookSecureTempFolder"
- Copy the contents in the value data: then paste on RUN
- Delete all files in that path then close and relaunch MS Outlook 2010