The scroll bars are part of the web page that you are viewing and are not
directly controlled by IExplore.exe as a command line parameter.
There is a command line parameter to open IE in kiosk mode (no toolbars,
full screen)
iexplore.exe -k
You can use a javascriptlete with window.open
Type the following in your address bar or in the run dialog.
javascript:window.open('about:blank',0,'scrollbars=no;toolbars=no');
(you need scripting to be enabled in your IE options)
Alternatively if you know some programming you can use Windows Scripting to
create a new internet explorer object without any toolbars or scrollbars.
(search the net to find out how)