To perform this step, you just need to search for the DLL file that's on your system, copy it and then move it to the C: Windows System32 folder. This can be done very easily just in Windows Explorer / My Computer. After you've done that, you should then use a 'registry cleaner' to clean out the registry database of your system. This software is designed to diagnose and repair Windows errors, systematically optimize speed, improve memory and fine tune your PC for maximum performance. Days of research and programming have led me to try all variants of inpout32.dll. Dll handle I/O to/from all parallel ports? Port on windows 7.