I know this is dumb question but here it goes. When Windows 7 Media Center starts up I had a number 50 and small bar under it when I start up. After installing cyberlink it now shows up with a 37 and bar under it. I am just wondering what this number means. 

Yep, that is the volume. If you are using HDMI for audio you will often see it take over the audio controller, and turn the volume up to full (50, indicated by the full bar).

-Casey