Hi,
A number of people have approach me with FSInn not working properly. Please use the following procedure to install FSInn, it should solve *all* FSInn problems including voice issues etc.:
1. Remove FSInn and FSCopilot completely
2. Check and make sure that the FSCopilot.dll file in C:\Program Files\Microsoft Games\Flight Simulator 9\Modules folder is also deleted (else delete it manually)
3. Download FSInn and FSCopilot from: http://x-file.de/load/fsinn/fsinn1.3_fscopilot1.7.zip
4. Install the two packages as usual.
Connect to some busy airport and check.
More about various other problems related to FSInn:
http://www.vatsim.net/pilots/pilotsclients/fsinn/fsinn-install/
I hope this helps.
Tanveer