z_setup.dll is a DLL file, and it belongs to the z_setup.dll Module program.  This file is part of the Dynamic Link Library.  This system allows your computer to run quickly and without having to use too much space at one time.  It is an excellent system, but its greatest strength is also one of its greatest vulnerabilities.  Many programs and applications have to access the library quickly and easily.  This is how errors can happen.  Often when you install or delete programs, but this also leaves room for errors.

If you want to fix your registry problems once and for all, then you need to invest in ZookaWare PC Cleaner the registry cleaner.  ZookaWare PC Cleaner is an excellent registry cleaner with proven results.  ZookaWare PC Cleaner offers a 100% error removal guarantee or your money back.  You will not find another registry cleaner that offers the same deal.