This is what I need to know/what you can do:
1) Are you using Lite-C or C-Script?
2) Did you also copied the correct header files into your workfolder?
3) Try to install the VC++ 2008 Redistributal Package.
4) Is the dll correct included using #PRAGMA_PLUGIN or dll_load()?
5) If you are using the default.c for ANet, did you updated it?