Task Listing using ShellHookProc

PLEASE DO PROVIDE FEEDBACK. I got another undocumented api call "ShellHookProc" which is exported from shell32.dll can be used to set system wide shell hook and get various shell related notifications like window created , window destroyed , and window activated. Attached to this article is the working code to implement this API. it is tested under my win2k and act as microsoft windows taskmanager list. but the problem is that it works as long as windows "explorer.exe" is running and fail to work if i register it as a shell in the registery and load at startup, can anyone tell me the way to get this working in that condition too. please help me out as soon as possible.