system
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I subsequently found a comment on the web about items added to the right click context menu can cause this problem. The one mentioned was for MBAM. So I disabled the MBAM option along with a few others and it did not help. Further after playing around with the right click options, the crash for explorer.exe is now occuring in ntdll! I haven’t disabled the Avast right click option. Might do that and see if it will stop the explorer crashes.
One thing I did not mention previously is that when an explorer crash occurs, I have seen activity coming from the lower task bar network connections icon; like a temporary discontent. This indicates to me that explorer might also me trying to dial-out for some reason at the time of the crash. Since I am using the WIN 7 firewall w/default config., nothing should be stopping explorer from dialing out if it wanted to.
My PC is clean as a whistle malware wise so I don’t think that is an issue.