Windows XP Service Pack 3 registry key

Hopefully a nice easy one for someone; I am looking to find if there is a particluar reg key that a machine running XP SP3 will have that no other XP machines does?
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HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\CurrentVersion
This key should differ
Dear markr81,

I guess what you're looking for is HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Updates\Windows XP\SP3\KB936929.
Under this, you will find:
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Updates\Windows XP\SP3\KB936929]
"Description"="Windows XP Service Pack 3"
"Type"="Service Pack"

Of the above your "InstalledDate" will be different and "UninstallCommand" will depend upon %SystemRoot% and/or %windir%.
You can read more about SP3 on

Kind regards,

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:) this you have to ask Microsoft team...
This key
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\CSDVersion
contain service pack number string like 'Service pack 3' or '' (empty string) if no service pack installed.
Tested on windows xp/2003/vista/7
best way is to execute this commandline:

wmic os get caption, buildnumber, csdversion, servicepackmajorversion, servicepackminorversion

also possible on remote systems:

wmic /node:computername os get servicepackmajorversion
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