This is what I had to do to get iLok.com to work and my Antares plugs to work in Sonar. I should let you know that eveything was working fine in Sonar untill after I demo'd Protools. After I removed Protools the problem occured.
Please see if the behavior persists with Data Execution Prevention set to its default value.
To change the Data Execution Prevention (DEP) settings for Vista or Windows 7: •Open the system properties (from Control
Panel, or Start->right-click on Computer->Properties)
•Click the "Advanced System Settings" link in the left sidebar.
•Select the "Advanced" tab
•In the "Performance" region select "Settings"
•Click the "Data Execution Prevention" tab in the Performance Settings box
•Select "Turn on DEP for essential Windows programs and services only"
•Click "OK" twice.
•Reboot your computer.