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IMPORTANT! FOR VISTA USERS
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After you completed the install, go to Start/Computer. Navigate to your
installation folder (the default is C:\Program Files\LaunchFax Client).

Right-click on the folder, choose Properties. In Properties screen choose
Security tab. It will display users and their pemissions. 

Click Edit.

Highlight Users and give them 
Full control permission by checking Full control checkbox below. 

Click OK to close.
And OK to close Properties window.