open the theme.rc with notepad and look for line that says

*netloadmodule modulenameVWM.dll
Place a comment in front of it like
;*netloadmodule modulenameVWM.dll

Litestep will not parse any lines that start with this symbol
So the module does not load...

If you want to try a theme that was designed around dual monitors
I would suggest Obsidian
http://www.nbi-studio.com/download.php?view.48