I use this (very) primative piece ... that will scan my users upon logon and tell me if it is less than SP6 ... maybe adapt?
code:
 $SP6A = READVALUE("HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Hotfix\Q246009","Comments")
If $SP6A <> "Windows NT 4.0 Hotfix:  Service Pack 6 Re-release"  shell "cmd /c net send aminidm %computername% old Service Pack here"
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If not for the last minute ... nothing would get done ...