Hello I am having trouble installing Office for Mac 2011 for my Macbook Pro. I recently installed Office for Mac 2010 30 day trial version and used it for a month until it expired. Once it expired I decided to buy Office 2011 for Mac home and student version. After inserting the disk into my Mac I was able to go through the full installation and it would say installation successful. Yet whenever I try to open any programs such as Word, Powerpoint, Excel, and Outlook I get an error message that wont allow to use program. Can anyone help me figure this out??