since $themedir$ is a litestep system variable (unless if I'm mistaken), then it sounds like you're trying to run an OTS2 theme on a non-OTS2 distro of Litestep. try getting the latest version of omar's installer (3.0.2). if that's not the case, then give us some more info (ls installer version, theme you're trying to run, OS version), and we'll try to help out more. however, if you just want to give up, then just hit ctrl+alt+del, bring up the task manager, and go to control panel-add remove programs and remove it.