After my niece used my computer this week, I came home to discover my system infected with a nasty virus that deleted the windows update service along with the Background Intelligent Transfer Service along with all sorts of other nasty things. This has nothing to do with System Center, but thought I would log it anyway since I had to create the service manually after an automated fix from Microsoft failed to restore the service to a functional state and I found no love in other forums.
First, check this link, it may help:
From an Administrative command prompt, type the following to restore BITS (Background Intelligent Transfer Service)
sc create BITS type= share start= delayed-auto binPath= "C:\Windows\System32\svchost.exe -k netsvcs" tag= no DisplayName= "Background Intelligent Transfer Service"
There should be trailing spaces right after the equal signs. The service registered successfully and picked up the dependencies as well without having to add those manually. The service is dependent on RPCSs and EventSystem in the event you do have to add those.