You have to put my Switch-Statement outside of your Select-Statement just before your Filewriteline. Something like this:
$msg = GUIGetMsg()
Select
Case $msg = $GUI_EVENT_CLOSE
ExitLoop
Case $msg = $Finish
;Something else
EndSelect
Switch $GUI_CHECKED
Case GUICtrlRead($OS)
$strOS = True
$strOSPlusApps = False
Case GUICtrlRead($OSPlusApps)
$strOS = False
$strOSPlusApps = True
EndSwitch
Could you please post more of your code or pm it to me, if you don't want it to be made public?
saudumm's post in Set radio button as selected by default was marked as the answer