That is so close to https://forum.avast.com/index.php?topic=120531.0 that I wonder if it's that same issue.
Tell more about this PC. Age, how long since you cleaned it with the canned air, etc.
Bob
My computer was working perfectly fine yesterday, I was using adobe after effects, and I left my computer for about an hour, when I came back, the computer was laggy and then I got the BSOD with the stop code 0x51. It would work fine in safe mode, but then started checking files when I would try booting it in safe mode and would hang on Windows\System32\Drivers\aswRvrt.sys
Now it won't start in safe mode, but will start up regularly, however it will crash about 30 seconds after start up. I don't know what to do!

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic