So you have already checked the Midi input filter..... hmmm
Did you setup your keyboard in PT?
If you don't know how, just open the PT .pdf and search for MIDI
What kind of keyboard? Is it connected via USB or into the MIDI ports on the 11R?
It may be worth another total re-install.
Update Windows 7 to SP1 if you have not already.
Also make sure you launch Pro Tools with Run As Admin
http://protoolsquicktips.blogspot.co...using-pro.html