Jacob normally loads jacob.dll by a call to System.loadLibrary ("jacob"). This will check all the 'normal' places, like the current directory and C:WindowsSystem32 etc. The alternative code posted by clay_shooter will first try to detect whether Jacob is run on a Win64 machine. Step 1 : Install the PC Repair and Optimizer Tool. (Windows 10, 8, 7, XP, Vista). Step 2 : Click Start Scan to determine what problems you are experiencing with your computer. Step 3 : Click Repair All to resolve all problems. There are two ways to save or re-save a DLL file. The first method allows you to save them all at once. please visit this articlesupport.microsoft.com/kb/249873/en-usthe module .dll failed to load make sure the binary is stored at the specified path Register 32 or 64-bit DLLs in Windows Step 1: First click on Start, then Run. Step 2: Now all you have to do to register a DLL file is to type in the regsvr32 command, followed by the path of the DLL file. Step 3: Now click OK and you should get a confirmation message that the DLL has been registered successfully. Register 32 or 64-bit DLLs in Windows Step 1: First click on Start, then Run. Step 2: Now all you have to do to register a DLL file is to type in the regsvr32 command, followed by the path of the DLL file. For registering the dll, copy the contents of the 32-bit folder into c:windowssystem (or c:windowssyswow64 if your computer is x64) and after that, open the console with admin privileges, position in the folder in which you have just copied the dll and run the following command: regsvr32 zkemkeeper.dll 1. Press Win+R to open Run. 2. Type the reg DLL command: regsvr32 " [the path of the DLL file]". The following is an example: 3. Click OK to execute the reg DLL command. 4. You will receive a confirmation message once the DLL file has been successfully registered. The Regsvr32 tool is a command-line utility that can be used for registering and un-registering OLE controls like DLL and ActiveX (OCX) controls in the Windo