I can't PROVE it was Norton, but I can say that as soon as I got rid of it, many problems went away and the system was far faster. The worst was loading drawings, where loading a drawing might take many more minutes to load with Norton Anti-Virus, etc. than without. I still keep Norton SystemWorks around, but have disabled the memory-resident portions of it.
Richard
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Richard Morrison, Architect-Interior Designer
AC26 (since AC6.0), Win10