That article kind of described the issue, but we actually do use sa as the designated login. I noticed this in the vpxd log just now when I tried to start the service. This is the very end of the log and attached is the whole log.
Win32 exception: Access Violation (0xc0000005)
Write (1) at address 0x000094
eip: 0x17669fb esp: 0x6e8f680 ebp: 0x6e8f680
eax: 0x6e8f694 ebx: 00000000 ecx: 00000000 edx: 0x6e8f601 edi: 0x711fb54 esi: 0x6e8f730
Exception: Win32 exception
Backtrace:
backtrace[00] eip 0x0128edf6 ?GenerateCoreDump@System@Vmacore@@YAXXZ
backtrace[01] eip 0x011d6d3a ?CreateBacktrace@SystemFactoryImpl@System@Vmacore@@UAEXAAV?$Ref@VBacktrace@System@Vmacore@@@3@@Z
backtrace[02] eip 0x011b185e ??0Throwable@Vmacore@@QAE@ABV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@@Z
backtrace[03] eip 0x011afe77 ?PanicExit@Vmacore@@YAXABV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@@Z
backtrace[04] eip 0x01293487 ?GetThisThread@System@Vmacore@@YAPAVThread@12@XZ
backtrace[05] eip 0x7c359c97 __CxxLongjmpUnwind
backtrace[06] eip 0x7c359629 __CxxExceptionFilter
backtrace[07] eip 0x7c3598ad __CxxExceptionFilter
backtrace[08] eip 0x7c35994a __CxxExceptionFilter
backtrace[09] eip 0x7c359b9d __CxxFrameHandler
backtrace[10] eip 0x7c828772 RtlRaiseStatus
backtrace[11] eip 0x7c828743 RtlRaiseStatus
backtrace[12] eip 0x7c82857e KiUserExceptionDispatcher
backtrace[13] eip 0x0092e793 (no symbol)
backtrace[14] eip 0x018c9a39 ??1ByUsername@EventFilterSpec@Event@Vim@@UAE@XZ
backtrace[15] eip 0x013c3d99 ?_GetType@MoRef@Vmomi@@UBEPAVType@2@XZ
backtrace[16] eip 0x013e6be6 ?_RecordPropertyChange@PropertyProviderMixin@Vmomi@@QAE_NABV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@PAVAny@2@1@Z
backtrace[17] eip 0x013e7dae ?_GetChanges@PropertyProviderMixin@Vmomi@@UAE_J_JABVPropertySet@2@_NAAV?$Ref@V?$DataArray@VChange@PropertyCollector@Core@Vmomi@@@Vmomi@@@Vmacore@@AAV?$Ref@V?$DataArray@VMissingProperty@PropertyCollector@Core@Vmomi@@@Vmomi@@@5@@Z
backtrace[18] eip 0x01407ba8 ?GetPropCollectorLogger@Vmomi@@YAPAVLogger@Service@Vmacore@@XZ
backtrace[19] eip 0x0140ac37 ?GetPropCollectorLogger@Vmomi@@YAPAVLogger@Service@Vmacore@@XZ
backtrace[20] eip 0x0140b6ac ?GetPropCollectorLogger@Vmomi@@YAPAVLogger@Service@Vmacore@@XZ
backtrace[21] eip 0x0140c03c ?GetPropCollectorLogger@Vmomi@@YAPAVLogger@Service@Vmacore@@XZ
backtrace[22] eip 0x0140c69f ?GetPropCollectorLogger@Vmomi@@YAPAVLogger@Service@Vmacore@@XZ
backtrace[23] eip 0x0129699a ?IsEnlisted@System@Vmacore@@YA_NXZ
backtrace[24] eip 0x012972ec ?IsEnlisted@System@Vmacore@@YA_NXZ
backtrace[25] eip 0x01292b0e ?GetThreadId@System@Vmacore@@YA_JXZ
backtrace[26] eip 0x7c349565 _endthreadex
backtrace[27] eip 0x77e6482f GetModuleHandleA
CoreDump: Writing minidump to C:\Documents and Settings\All Users\Application Data\VMware\VMware VirtualCenter\Logs\vpxd-7716-6364.dmp