http://www.hp.com/bizsupport/detailpages/ca2/sdd_printer_driver_check_tool_en.htmlETA: Oops, I see you probably have: "...could not find it on the HP site. (I since have)."
Good luck w/ the refund, I fear you are SOL there. I found a review here
http://www.techpin.com/driver-detective-review-the-truth/ "Driver Detective Review - The Truth" that includes a statement from the president (supposedly) of Driver Headquarters, along with an e-mail address.
IMPORTANT!
A message regarding Driver Detective:
Since 1996, Drivers HeadQuarters has worked to provide the highest level of service to each of our customers. If you have any questions about Driver Detective or opportunities for us to improve our service, please contact me directly or visit our website at http://www.drivershq.com.
Mike Hurd
President, Drivers HeadQuarters
mikehurd (at) drivershq.comI would uninstall IMMEDIATELY & also run a scan w/ Malwarebytes' if I were you.