RTVSCAN and SVCHOST are using 100% of CPU usage how can we stop

See After installing Symantec AntiVirus 10.1, Rtvscan.exe uses 100% of the CPU (http://service1.symantec.com/SUPPORT/ent-security.nsf/0/9de45e757a1f6b6b8825713f00564bbe?OpenDocument&seg=hm&lg=en&ct=us). If you are running a different version search the Symantec knowledgebase, it's been an ongoing issue over the years.