Inno Setup issue: windows security shield does not appear on setup icon

I created setup using inno setup as well as using QSetup (and other install builder applications).

All setups were created using Admin privileges but the setups that were created using inno setup do not have a windows security shield setup icon. However this security shield mark appeared automatically on icons of all other setups.

Due to this issue, installer that was created using inno setup will not install on a number of Windows vista Machines when downloaded from website.

In Windows Vista machines, when I double click on such installer, nothing happens.

I used:
PrivilegesRequired=admin

Please help!

see the attachment here
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What has your question to do with WinSCP?