Windows 2008 AND IISRESET.EXE
IISreset.exe is a magical command that resolves many problems! Err… well, yeah that command restarts all IIS related processes and thus essentially running it cleans up all the “mess”. So is there anything special about IISReset.exe in Windows 2008? Yes and I do not recommend using it and here’s very useful information that you must know about what this command does.
Read more here http://blogs.msdn.com/sudeepg/archive/2009/02/14/windows-2008-and-iisreset-exe.aspx