My system began to run very slow. The Norton products would take minutes to repsond to 'right-clicks' on the context menu. Other programs began taking minutes or longer to run. scanpst.exe (Microsoft's Outlook personal folder scanning and checking tool) went from 6 minutes to over 70 minutes to run.
Resource Manager showed that nav.exe was writing > 7MB/sec to distrptr.dat and distrptr.dat.log.
I downloaded the NRnR.exe tool, removed and re-installed Norton AV. Everything ran fine for about 1 month at which time I was informed my subscription had expired (it was atuomatically renewed less than 60 days earlier). Contacted support, they resolved the license issue and things were good for about 2 weeks. At that time the disk I/O for distrptr.dat was once again over 6MB/sec.
I ran NRnR.exe once again to remove and re-install the product.
At this point, if I have any other issue with this I'm going to remove it completely and install McAfee which is a shame as I've been a loyal Norton user since the ealry 90s.