I work for a company who is trying to make their software package work with Vista.  We used to use its built-in function FindWindow to check if a certain service was running at the time of install.  Pre-Vista this worked properly but on vista machines this function returns that the service is not running when it is.  I assume FindWindow is making use of the EnumWindows API call and checking this list for the service they are looking for.  I wrote a Delphi program to list everything returned by EnumWindows.  When I run it on an XP box it returns all normal programs and services, but in Vista it does not include the services.  I think this is the reason that InstallShield's function FindWindow does not work for detecting a Vista service, because they probably used EnumWindows API and it doesn't work to detect services anymore.  So I need to write a DLL or something to check to see if a certain service is running.  How can I do this with Delphi (we use D5) and Vista?  Keep in mind I am developing on an XP machine not a Vista machine so I hope thats not a problem.