I believe I have less than a dozen machines affected out of about 150 in that OU. I haven't seen the issue on similar machines in other groups, so I believe the mix of software and/or policy with this update is a bigger factor than the hardware. Although all of these machines are OptiPlex 390's, there are lots of other 390's without the problem. I am just going to go nuclear with the solution since I have a 390 with a recent image and all the updates including last night's that is solid. The ones with the problem are probably the ones that have been deployed the longest time - several years. I can deploy them fairly quickly rather than tie up more time figuring out what is crashing some but not others.