I apologize if this has been covered before. A search and a lot of browsing revealed nothing.
Garmin Express apparently uses Windows Background Intelligent Transfer Service (BITS) to download new maps. This is the same service used by Windows Update.
Garmin Express created 10 download jobs on my Win7 x64 PC. The downloads kept error-ing out and restarting and had my connection maxed out for 5 days, resulting in a nasty-gram from my ISP that I had exceeded their secret data cap of 150 GB! The jobs are all named 'Garmin Download'.
I managed to pause the jobs by manually stopping the Background Intelligent Transfer Service in 'Services', and I eventually uninstalled Garmin Express as recommended here, but the jobs remain in the BITS que. I tried to cancel them using both 'CMD' / 'BITSadmin' and 'Windows PowerShell' / 'BitsTransfer' (both run as admin) but was denied because the 'Owner' is 'NT Authority'.
So I now have BITS service disabled and can't receive Windows Updates, and I can't cancel the never-ending Garmin Express download jobs. Garmin support has not answered my emails, but if/when they do I'm sure it will be some nonsense unrelated to this problem based on past history.
Can anybody help me figure out how to kill these never-ending downloads?