detecting installed application

Hi,
Is there an easy way to detect whether a specific application is installed 
in Windows?

Our game runs from the CD tray (no install) and I want to provide a link to 
our PDF manual. If the player has Acrobat installed, I want to open the 
file, it they don't have acrobat installed, I want to ask the player if they 
want it installed or not. So I need some way to detect whether Acrobat is 
already installed.

Cheers,
Brett 


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