nsExec is performing very slow

[123mobile]

Notepad was just an example, my problem is whanever I am using nsExec it is not coming to the point of completion so that I can exit my installer properly, I have to kill the process from taskmanager. It is somehow not returning back.
Use rather this script, the same thing will
happen.

;NSI script begins--------------------------
Name "nsExec Test"

OutFile "nsExec Test.exe"

ShowInstDetails show


Section "MakeNSIS commands help"
nsExec::ExecToLog '"${NSISDIR}\makensis.exe" /CMDHELP'
Pop $0 # return value/error/timeout
DetailPrint ""
DetailPrint " Return value: $0"
DetailPrint ""
SectionEnd

;NSI script ends--------------------------