NSIS Not responding

[pkonduru]

Hi All,

During installation , my custom dialog goes into not responding state(ion top of the installer window). The custom dialog has a button which the user can click to stop and uninstall an existing windows service. It works fine most of the times but sometimes when the windows service takes a while to stop, the NSIS window goes into not responding state and I have to cancel the install from the task manager.
Here is my code for the custom page buttonClick. In brief, the code below does the following.
--Enables the button when dialog is shown
--Gets the windows service binary path, based on this the installer knows where the .bat file is to stop and uninstall the service.
--Stops the service(this is the piece that's causing the issue)
--Uninstall the service
--enable the button and also the next button in the dialog

EnableWindow $hCtl_ExistingHub_Button1 0
${NSD_SetText} $hCtl_ExistingHub_Button1 "Stopping Service..."

SimpleSC::GetServiceBinaryPath "MyService"
Pop $0
Pop $1

Push "$1" ; contains the service executable string
Call GetFirstStrPart
Pop "$R0"

Push "$R0" ;get parent directory from service string
Call GetParent
Pop $R0

Push "$R0"
Call GetParent
Pop $R0

SimpleSC::GetServiceStatus "MyService"
Pop $0
Pop $1
${If} $1 == "4"
ExecDos::exec /TIMEOUT=5000 /TOSTACK "$R0\bin\stopservice.bat"
;ExecDos::exec /TIMEOUT=5000 "$R0\bin\stopservice.bat"
; Pop $0
MessageBox MB_OK "Existing Service stopped"
${EndIf}

${NSD_SetText} $hCtl_ExistingHub_Button1 "Uninstalling Service..."
ExecDos::exec /TIMEOUT=5000 /TOSTACK "$R0\bin\uninstall.bat"
MessageBox MB_OK "Existing service uninstalled"
${NSD_SetText} $hCtl_ExistingHub_Button1 "Uninstall"
EnableWindow $hCtl_ExistingHub_Button1 1
GetDlgItem $1 $HWNDPARENT 1 ;//Enable "Next" button
EnableWindow $1 1

I also tried stopping the service using the SimpleService plugin, this brings up the "Not responding" state too but I don't have to cancel from the task manager as it finally comes back to normal state after sometime.