When I click on the shortcut in the start menu I get s security pop-up asking If I want to let ahc.exe make changes to my system. I also get the pop-up when I use CS2 help. When I give the OK I get CS2 help from CS2 and get this from the start menu shortcut:
When I double click on ahc.exe in the file explorer I get this:
Something may be messed up in you install of Adobe Help Center. There is no entry in the control panel Programs and Features for it on my system. Perhaps if you reinstall CS2 on top of itself the problem will be fixed.