avast! free 6.0.1289
Windows 7 x64

EventLog Error 6008
“The previous system shutdown at xx:xx:xx on xx.‎xx.‎xxxx was unexpected.”

I’ve had this error on two of my systems since the latest beta of avast free (when it was at beta state) when I shut my systems down. When I unistalled avast and reinstalled the stable version at that point (6.0.1203), the problem was gone. So it’s most likely avast related.

That error occurs regularly, but not every single time (could be like “yhe1” stated), when I shut my system down normally:
Start → Shut down or reboot, also when I schedule a shut down with command “shutdown -s”.