1. What is the exact error message?
2. Since from when are you facing this issue?
3. Are you trying to use the Windows speech recognition utility or anyt third party application?
Method 1:
Try performing SFC scan on the computer.
SFC /scannow is a super-useful command you can use in any Windows version. When the SFC (System File Checker) command is used with the /scannow switch, the tool will scan all of the important Windows files on your computer and replace them as necessary.
Missing and corrupt operating system files (like many DLL files) are arguably the biggest cause of major Windows issues. Considering that, plus the fact that SFC /scannow is completely automatic and very easy to use, the tool should usually be one of your
first troubleshooting steps.
Refer:
How to use the System File Checker tool to troubleshoot missing or corrupted system files on Windows Vista or on Windows 7 http://support.microsoft.com/kb/929833
Method 2:
If the issue has occurred recently, then I suggest you to perform a system restore to revert back to the correctly working settings.
