BITS Startup Type
The Startup Type for BITS is delayed auto-start.
Prior to Windows Vista: The Startup Type for BITS is Manual. When a BITS job is created, the Startup Type changes to Automatic. The Startup Type returns to Manual when all jobs are complete or canceled.
You should not set the Startup Type to Disabled. Disabling BITS may break applications, such as Windows Update, that rely on BITS to transfer files.