Background Intelligent Transfer Service
Windows Vista Service Details
BITS is essentially a download manager. It allows for downloads to be resumed later, and is fault tolerant. Windows Update uses this. If you disable it and run Windows update, it will automatically be set to Automatic (Delayed Start). Used for asynchronous downloading of Windows Updates.
Transfers files in the background using idle network bandwidth. If the service is disabled, then any applications that depend on BITS, such as Windows Update or MSN Explorer, will be unable to automatically download programs and other information.
Consequences of Stopping:
All services listed in 'Required For' will be unable to function