Running an Exe on Vista using run as administrator

HI,
i have a .exe file which is target for a shortcut which i am creating using NSIS.when i click on the short cut in vista that exe is not running rather it is showing an error
where as if i right click on the exe and selecting the option "Run as Administrator" by locating it.then it shows allow deny window after selecting allow it is running smoothly.
if any one faced this problem please help.

I dont run Vista so I cant help out much....

Try

RequestExecutionLevel admin

in the code