If another AV shuts down WD, then until that AV is disabled and is not allowed to automatic-start, WD will continue to either be shut down or will turn itself off.
well-balanced, well-configured mult-layered defense is best
Other Info
From MS-DOS 3.3, MS-DOS 6.22, from Windows 3.1 to WFW 3.11 to Windows 95-98SE, now to Windows 7 Pro.
Security for now: Windows 7 Firewall, Emsisoft AM, MSE [scan-only], SpywareBlaster, Ruiware/BillP combine