windows installer service could not be accessed

Well, I'm never one to leave well enough alone and something I've done from my last good build (ya, I should test each change once at a time I guess) is causing this error when my start.cmd runs. Anyone have a clue as to the most likely cause of this?

Various info...

[COMMANDS]
"REGEDIT /S regtweaks.reg"
"useraccounts.cmd"

useraccounts.cmd is setup identical to what's in the guide...

Windows Registry Editor Version 5.00 

;Disable Automatic Restart in the event of a BSOD
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\CrashControl]
"AutoReboot"=dword:00000000

;Speed up shutdown
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control]
"WaitToKillServiceTimeout"="3000"

;Disable the Desktop Cleanup Wizard
[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Desktop\CleanupWiz]
"NoRun"=dword:00000001

;Disables Windows Tour bubble popup
[HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Applets\Tour]
"RunCount"=dword:00000000

;Disable Remote Registry Service
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\RemoteRegistry]
"Start"=dword:00000004

;Disable Anti-virus Notifications
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Security Center]
"AntiVirusDisableNotify"=dword:00000001

;Disable Firewall Notifications
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Security Center]
"FirewallDisableNotify"=dword:00000001

;Disable Automatic Updates Notifications
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Security Center]
"UpdatesDisableNotify"=dword:00000001

;Disable Indexing Service
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\cisvc]
"Start"=dword:00000004

;Disable Update Device Driver Wizard
[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer]
"NoDevMgrUpdate"=dword:00000001

I won't list my start.cmd (set to run from GUIRunOnce) unless someone thinks it's necessary...I can click continue through the errors and it fails on every installer, all of which work in a previous build.

I appreciate anyone who can save me a lot of time/effort on troubleshooting this!