With regedit:
@echo off
setlocal
::if the scrit is not ran as administrator
:: and the key does not require admin permissions
set __COMPAT_LAYER=RunAsInvoker
set "key=%~1"
set "value=%~2"
regedit /e "#.reg" "%key%"
for /f "tokens=1,* delims==" %%a in ('find """%value%""=" "#.reg"') do if "%%~b" neq "" echo %%~b
del /q #.reg
endlocal
Example:
call regreader.bat "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\NET Framework Setup\NDP\v3.0\Setup\1033\" Version
output:
3.0.30729.4926