Outlook 2007 and monitor viewing problem

I am a Windows Vista user and I have installed Office 2007 standard. When I launch outlook, it distorts the colors in all applications as long as Outlook is open. When I close it, the monitor goes back to the clarity and color it is supposed to be.

I have uninstalled Office and reinstalled it and the problem still persists.

Does anyone know what might be causing this?

Thank you,