No dude, you should not use iexplore. First, it is a silly, slow and retarded program. Second, it will only start itself and not the user's preferred browser. Third, it is not in the default search path and will therefore fail in many situations (the command line in the windows start menu has special handling to make it work).
This opens the page with default browser System.Diagnostics.Process.Start("http://www.codeproject.com"); this is like using ShellExecute same behavior.
this throws Exception (I don't have word) on my PC