There are several reasons why the Business Contact Manager (BCM) might not load, rather than guess, the best thing to do is to have BCM generate a log file so you can analyze the problem more methodically! How cool is that ? 
Here's what you need to do to invoke logging in BCM:
- In Outlook, go to the Help Menu
- Click on About Business Contact Manager for Outlook.
- A window will open, in this window click on the checkbox to enable logging for BCM.
- The log file that get's generated is located under: c:\Users\YourName\AppData\Local\Temp\BCMLog_Vx.log
Open the file and have a look around! This should help you determine what the trouble is without a lot of guess work! 