Corrupt dll error on Winamp

Hello
I am sure that I’m having problems through a corrupted .dll file.
Until now I've observed that it has affected Windows Photo Gallery as well as Win amp.
When I want to open these programs I get the following error message:
winamp.exe Bad Image
C:Windowssystem32WindowsCodecs.dII is either not designed to run on Windows or it contains an error. Try installing the program again using the original installation media or contact your system administrator or the software vendor for support.
OK
Please help.
Thanks in advance.
