@echo off
setlocal enabledelayedexpansion
FOR /F "skip=1 delims=" %%i IN ('wmic product where "name like 'FileWave Client'"  get IdentifyingNumber') DO (
set GUID=%%i
goto end
)
:end
setlocal disabledelayedexpansion
REM echo %GUID%
msiexec /X %GUID% /QN