The latest Webroot release 18.104.22.168 with its updated wrkrn.sys file seems to have caused some BSOD's with 2008r2 after our systems rebooted last night. I was able to delete the file from a repair command prompt and then reboot into normal operating mode.
I have a ticket in with Webroot support about this issue, but I thought my issue should be shared.
Update: I have talked with an MSP using Webroot who has had the same problem today. They also report that if you reboot your machine again after Webroot has a chance to reinstall the wrkrn.sys file it will start throwing up BSOD messages again.