I don't think this is an avast! problem, but I have never been able to get the "Protection Mode" to work on my laptop. Other than that it scans just fine. Every time I enable it I have problems after one boot or so. (If it weren't for Rollback Rx I'd been in trouble.) As I said, I don't think this is an avast! problem, but have yet to track it down. Other than that they work perfectly together. They leave each other alone as far as I can tell.