On Page 6 of the Avid Windows Guide – Windows 7 Optimizations and Troubleshooting, it is written:

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“RUN AS ADMINISTRATOR”

This can help with a variety of MIDI issues (ie, no MIDI output or HUI communication) and using the Digidesign hardware driver in third-party DAW’s.

o Right-click on the problematic application’s icon on your desktop
o Choose Run as Administrator

to permanently run an application as administrator:

o Right-click on the problematic application’s icon on your desktop
o Choose Properties
o Click on the Shortcut tab
o Click on Advanced
o Check the box that says “Run as administrator”
o Click OK
o Repeat all of the above steps for any other icons or shortcuts that you use to launch Pro Tools.

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Thanks to Sweetwater Customer John Lawson