Fixes ZEN-5871: Refactored solution to consolidate bad counters, set eventkey, create clear event, and provide user explanation (reviewed by epowell)

git-svn-id: http://dev.zenoss.com/svnint/trunk/core/zenpacks/ZenPacks.zenoss.WindowsMonitor@73580 f5df01ce-0320-0410-9ed9-ddcd13c732cc