We have a small number of machines that started to blue screen after installing December Microsoft security patches ( Approximately 10). They are all E6410 running xp sp3 and Sep 11.0.6100.645. They may have other things in common. It appears to be resolved after uninstalling MS11-098 ( KB 2633171). Has anyone else had this issue?. Note: they are not running PGP encryption, so this is not the same issue that was seen with MS11-011 (kb 2393802 ).