An examination of the event logs on my machine reveals that this error began cropping up on my notebook back on 8/19, with the first instance being at 11:18AM, following a restart four minutes earlier. The immediate previous system change preceding that restart was the installation of Windows Defender Definition 1.181.42.0 (KB915597) at 4:19AM. That update did not force a restart, but took effect following the next restart... which came at 11:14AM, roughly seven hours later.
The system change previous to that was the installation of the latest version of HP Update Manager on 8/17, but there were several restarts between that installation and the onset of the problem. For this reason, I'd rule out the possibility that the HP product is responsible, just as I would rule out the next series of updates (on 8/21, including Java SE and the latest Windows Update Engine) as responsible for the problem.