How do I make a Launcher for multiple exes?

problems but it works now except for the part at the end where I want it to execute several exes if a variable is "true".
I'll post it:

OutFile "Launcher.exe"
;SilentInstall silent
RequestExecutionLevel user
Icon "\Documents\nsi\PAPPS.ico"
!include nsDialogs.nsh
!include LogicLib.nsh


Page custom nsDialogsPage
Page instfiles
;=== Variables
Var CHECKBOXFF
Var CHECKBOXTB
Var CHECKBOXPC
Var CHECKBOXCW
Var CW
Var FF
Var TB
Var PC

Function nsDialogsPage
	nsDialogs::Create /NOUNLOAD 1018
	Pop $0
	${NSD_CreateCheckbox} 0 10 100% 8u Firefox
	Pop $CHECKBOXFF
	GetFunctionAddress $0 OnCheckboxFF
	nsDialogs::OnClick /NOUNLOAD $CHECKBOXFF $0
	${NSD_CreateCheckbox} 0 70 100% 8u ClamWin
	Pop $CHECKBOXCW
	GetFunctionAddress $1 OnCheckboxCW
	nsDialogs::OnClick /NOUNLOAD $CHECKBOXCW $1
	${NSD_CreateCheckbox} 0 30 100% 8u Thunderbird
	Pop $CHECKBOXTB
	GetFunctionAddress $2 OnCheckboxTB
	nsDialogs::OnClick /NOUNLOAD $CHECKBOXTB $2
	${NSD_CreateCheckbox} 0 50 100% 8u Popcorn
	Pop $CHECKBOXPC
	GetFunctionAddress $3 OnCheckboxPC
	nsDialogs::OnClick /NOUNLOAD $CHECKBOXPC $3
	nsDialogs::Show
FunctionEnd
Function OnCheckboxFF
SendMessage $CHECKBOXFF ${BM_GETSTATE} 0 0 $0
${If} $0 != 0
  StrCpy $FF "true"
  ;SetAutoClose true
${EndIf}
FunctionEnd

Function OnCheckboxCW
SendMessage $CHECKBOXCW ${BM_GETSTATE} 0 0 $1
${If} $1 != 0
  StrCpy $CW "true"
  ;SetAutoClose true
${EndIf}
FunctionEnd

Function OnCheckboxTB
SendMessage $CHECKBOXTB ${BM_GETSTATE} 0 0 $2
${If} $2 != 0
  StrCpy $TB "true"
  ;SetAutoClose true
${EndIf}
FunctionEnd

Function OnCheckboxPC
SendMessage $CHECKBOXPC ${BM_GETSTATE} 0 0 $3
${If} $3 != 0
  StrCpy $PC "true"
  ;SetAutoClose true
${EndIf}
FunctionEnd

 Function .onInstSuccess
${If} $FF = "true"
	Exec Firefox.exe
${ElseIf} $CW = "true"
	Exec Clamwin.exe
${ElseIf} $PC = "true"
	Exec Popcorn.exe
${ElseIf} $TB = "true"
	Exec Thunderbird.exe
${EndIf}
  FunctionEnd
Section
SectionEnd