How to enable a window?

[afallenhope]

Hello all I am trying to use this function to detect if a specific window is running. Then for it to activate it and send an ALT+F command to close the window. But I cannot seem to get it to detect the window and subsequently the rest of the code does not work. 

#include <MsgBoxConstants.au3>

Handleit()
   Func Handleit()
      If WinExists("[CLASS:MsiDialogCloseClass]","InstallShield") Then
         WinActivate("[CLASS:MsiDialogCloseClass]","Installshield")
         Send("!f")
      Else
         MsgBox($MB_SYSTEMMODAL, "", "Uhhh... something didn't work. Fix it!")
      EndIf
   EndFunc

Is there anything that I can substitute for the CLASS? 

Thank you for taking the time to read my question! 

-Richard

[BrewManNH]

Have you tried it without the Text parameter?

[afallenhope]

I feel like a fool for such an easy fix. Thank you kind sir!