Check is ActiveSync 4.5 installed

How can I check this: "is ActiveSync version 4.5 installed?"

- if not installed, show a box with the link of the ActiveSync 4.5

Please help!

THX!

Checkout the registry, or search in a specific location (e.g. under system folder) for file(s) that should reside there if it is installed.
Set up a custom dialog with the link and show the dialog if it's not installed.

Mode detailed please

HI!

Thanks for the answer! Please, write it more detailed with the source code. ...I'm begin!

THX

try lookin into this plugin....I used to look up if a file exists on the target machine before installing my application:

Where is the link?

Where is the link? I not see it!