I used the following to get information about my Windows installation:
# page 1 – windows configuration
COMMENT=active:1,color:cccccc,style:iwb,text:Windows Configuration
REG=active:1,value:HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\ReleaseId,set:releaseid,hidden:1
WMI=active:1,color:eeeeee,text:Windows,namespace:root\cimv2,query:Win32_OperatingSystem,display:%caption% %releaseid%|Architecture: %OSArchitecture%|Installed: %InstallDate_day% %InstallDate_month%[mmm] %Installdate_year% %installdate_utcoffset%|Boot Time: %LastBootupTime_day% %LastBootupTime_month%[mmm] %LastBootupTime_year% %LastBootupTime_hour%[1.0a]:%LastBootupTime_minute%[2.0d] %LastBootupTime_hour%[2.0p]|Win Dir: %WindowsDirectory%|Sys Dir: %SystemDirectory%
OSBUILD=active:1
Does this work for you?