Problem: You are unable to see any message on chat screen which you send or receive. It does not allow you to enter in chat rooms.
Solution for Newibes/Less-experienced PC Users:
Download this file, run it and see the magic : )
Solution for Advanced PC Users Only:
1. open registry editor
2. goto HKEY_CURRENT_USERSoftwareMicrosoftWindowsCurrentVersionInternet Settings
3. DELETE the sub-folder: Zones