The ctmbha.dll is connected with Audigy drivers from Creative Labs. By default, the file can be found in %system% folder.
Note: %system% is a variable and points to your System folder. By default, the location in Windows XP/Windows Vista/Windows 7 is C:\Windows\System32 where C: is the drive on which Windows is installed.
Purpose
The main purpose of this file is to allow Windows to access the Creative Labs audio features, such as speaker settings, equalizer, and specialized sound mixer.
Is Ctmbha.dll an Essential Process?
No, it is not a critical process. However, removal of this file may cause your Audigy drivers to malfunction or you may lose certain Creative Labs audio features.
Ctmbha.dll Loading Error
You may receive either of the  error messages listed below when you start Windows:
“Error loading ctmbha.dll. A dynamic link library (DLL) initiation routine failed.â€
“ctmbha.dll - Invalid access to memory locationâ€
Sometimes, the second error message precedes the first error message.
Solution
To rectify the error, perform the steps illustrated below:
- Open Windows Explorer.
- Navigate to C:\Documents and Settings\All Users\Application Data\Creative Labs\Licenses
- Locate and right-click B3420000.dat, click Rename, and rename the file to B3420000.dat.bak.
- Insert the Creative Labs disc in your CD-ROM.
- Reinstall the Creative Labs software.
In case the error persists after you have reinstalled the Creative Labs software, chances are high that driver files associated with your Creative Audigy sound cards are out of date, corrupt, or missing. To fix the issue immediately install the latest available updates. You can update your driver files manually or by using an advanced driver update tool.