Silent DirectX Installation

Hi,
According to 
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/directx9_c/Simplifying_Game_Installation.asp 
it is recommended to do a silent install of DirectX, but we're having 
trouble making this work.

Our game doesn't need to be installed, so we're running stright from CD. 
When the CD is inserted, or the application launched, a "launcher" dialog is 
displayed. If the player clicks "play", then we are calling:

ShellExecute(NULL, "open", "DirectX/dxsetup.exe", "/silent", NULL, 
SW_SHOWNORMAL);

But this call doesn't seem to block and returns immediately, so if the 
player didn't already have the latest DX installed, it would be partway 
through installation when the game launched and of course this doesn't work.

Is there a way or API to run a program and block until it finishes?

Thanks,
Brett Bibby
GameBrains


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