This file has been reported to be part of a spyware/malware/trojan. It is likely that the problem you are experiencing is linked directly to the spyware/malware/trojan rather than an actual missing DLL-file and the recommended course of action is to first locate/remove the Malware. We do not recommend downloading this file.
DLL-Files.com Support says:
This is a possible manual solution for you 'handyman-fixers' out there: (at your own risk)
This is an old description of this file, but it seems like the company behind the file have changed on how they are using the file so that it may not be classified as a spyware anymore.
cdaEngine0400.dll is part of WildTangent Spyware.
Uninstall WildTangent from "Add/Remove Programs" in the Windows® Control Panel. The vendor is also offering uninstall instructions. If you run into problems uninstalling, please contact the vendor for support. Note that you will not be able to play WildTangent games if you decide to uninstall.
Earlier versions of WildTangent's uninstaller left a large number of files in the "%WinDir%\wt\" folder which can be deleted manually after running the uninstaller. Note: %WinDir% is a variable (?). By default, this is C:\Windows (Windows 95/98/Me/XP) or C:\WINNT (Windows NT/2000).