Close All Window Issue

[BigDaddyO]

I got some help from some people on this site a while ago with how to close all open windows. The following code was given to me and it works great, But on some computers it will bring up the Shutdown windows screen, then close it, then bring it back up and get stuck in this loop. Any ideas?

Send("!+{Tab}");Alt+Tab switches to the next active window

While Not WinActive("classname=Progman");Program Manager is the Desktop
  WinKill("");kills the active window
  WinClose("");Because WinKill might not work on Explorer windows
  Send("!+{Tab}")
  sleep(100);pause a few milliseconds
WEnd

[Valik]

Are the machines it tries to shut down Windows 9x machines? Is Progman the classname of the the desktop itself on 9x (It is on 2000/XP). Killing off the explorer process (Or Desktop window) on Windows 9x will try to shut the computer down.

[BigDaddyO]

I only run the script on 2000/XP machines. The problem will occur on either a 2000 or XP but not on every computer, just some...