go to your theme's folder and in the theme.rc add a line that points to the icon folder of that theme (i think that'd be the problem)

for your case it'd be (something like):
IconsDir $ThemeDir$icons\

except where it says "icons\" change it to the path from the theme's folder to whatever the name of the icons' folder is (or you could just go to the icons folder and copy/paste the entire address)

so if you copy/pasted the address it'd be something like:
IconsDir C:\Litestep\themes\theme_youre_using\icons\

i hope that made sense :)