Can't register UFL dll. Missing WER.DLL and IESHIMS.DLL

Hello,

I don't think this is directly related to Crystal Reports, but I am unable to create User Defined Functions.

I created a very basic function. I built the DLL in Visual Basic from Visual Studio 2008 on a Windows XP machine. When I try to register the DLL, I get a message saying the DLLInstallEntryPoint was not found. Using the Dependancy Walker tool It shows that it can not find the WER.DLL file and the IESHIMS.DLL files. I have googled everywhere to get an answer on this. It appears to be a common problem but no published answers.

Any help would be much appreciated.

Thanks,

Scott