xcopy "V:\Tools\Radmin" "C:\Program Files\Radmin-cas\" /s /e /y /q

works great at command line

but

SHELL "%COMSPEC% /C xcopy "V:\Tools\Radmin" "C:\Program Files\Radmin-cas\" /s /e /y /q"

fails

invalid number of parameters AND Script Error unknown command V:\Tools etc. etc