system
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In response all I can say is that I had boot issues with aswrvt.sys and after test signing the driver manually using third party sofware the issue was resolved and has never resurfaced. It used to happen on a regular basis and I would restore my windows partition from backup but that meant losing recent work as I only make system image backups every week or so. It might be worth noting that there are other unsigned drivers on my machine including one from Softperfect RAMdisk. I had boot problems so often that in addition to manually signing drivers I resorted to permanently disabling driver signature enforcement and all has been well since I took that step. I use the application whitelisting component of Secure Aplus (no AV) to provide some protection against unsigned files and potentially harmful scripts as obviously security would be lessened otherwise.
In addition aswVmm.sys also appears to be unsigned.