The DLLregisterServer entry point not found. How do I fix it?

Hi Brainy,
When I try to register a plugin in windows operating system using the command prompt as administrator, I go this error message pop up message. For your information, I have windows operating system 32-bit and 500 GB hard disk. The error says the DLLregisterServer entry point not found. How do I fix it? Please help.

RegSvr32
Sap 2000Plugin_CSI_Sample1.dll was loaded, but the DLLRegisterServer entry point was not found. This file cannot be registered.
