It has been a while, but I used and installed this on several machines. Now it won't work. I have an XP Professional Machine. I went to Microsoft and downloaded and installed Microsoft SAPI 5.1 from the SpeechSDK51.exe file. There is also a SpeechSDK51MSM.exe that seems to just be redistributables. I am used to "Microsoft Speech Object Library" just showing up in the references. It just shows "MISSING" instead and my project of course won't compile. I checked and see SAPI.dll in the same folder as it is on a working XP machine. What am I missing? Thanks!