The MS Office drive Q is put there by design and should have nothing to do with your security system. What makes you think it has something to do with the Bunker Hill system?
Harbor Freight lists it's web site as the "official" Bunker Hill web site. Their tech support info below. Bunker Hill may be a brand name of theirs, I'm not sure.
1-888-866-5797, Monday thru Friday, 6:00 am to 6:00 pm PST.
Answered Oct 23, 2011
Edited Oct 23, 2011