For Those who are not able to get Voice in Yahoo messenger when using Windows Vista install this small codec file TSP Codec For Windows Vista and make sure you have Yahoo Messenger 8.1.0.244 or higher before installing this codec.
Click The Read More Button Below to know the other steps involved in installing this driver.
1. Open Windows Explore goto C:/Windows/System32 and Rename tssoft32.acm to tssoft32OLD.acm
2. Click Here to Download tssoft32.acm save in C:/Windows/System32 folder
3. In Control Panel, go to Add Hardware.
4. Click Next and after it searches choose Yes, I have already connected the hardware Click Next.
5. Scroll down to the bottom of the Installed harware list and choose Add a new hardware device Click Next.
6. Choose Install the hardware that I manually select from a list (Advanced) Click Next.
7. Choose Sound, video and game controllers from the Common hardware types list. Click Next.
8. Click on the Have Disk button.
9. Click Browse
10. Navigate to the C:/Windows/System32 folder
11. Choose $winnt$.inf Click Ok. (if you cant find that file try mmdriver.inf )
12. Click Continue Anyway if you get a warning box.
13. Select DSP Group TrueSpeech Audio CODEC from the list. Click Next.
14. Click Next again to install.
15. Restart if necessary.
16. Done! Voice should now work if you followed the steps correctly...