Which version of Windows are you using? Which build/distro of LiteStep do you have installed? (C:\Litestep\Litestep.exe !About -will give the build date.) And what precisely is the name of the theme? (The !about box tells that, too.)

By most reports, the most trouble-free way to start LiteSteppin' is with Omar's LiteStep Installer. The link to it's on the Home and News pages, iirc.