Before anyone flames you for not reading documentation, I'll go out on a limb and help you.

Right now the only thing you need to do is forget about litestep for a while untill you've read enough that you'll know what it is your going to do.

To fix your current situation, when you press ctl-alt-delete, check your processes to see if litestep.exe is running. If it is, end that task.
After you end any instance of litestep.exe running on your system, do not exit out of your task manager(the ctl-alt-delete window). In that window, go to FILE/NEW TASK(run).
You'll then get a run box that will pop up. In that run box simply type in EXPLORER.EXE and press enter.
That will start up your normal explorer shell with your taskbar, start menu, etc..

After you get that all done, keep in mind the next restart, you'll probably have to do it all over agian untill you find out what type of litestep you installed, what theme your running, and READ! I can't stress that enough, READ untill your eyes bleed!

Everything I've just typed out has been talked about 100+ times and most litestep users are really sick of people jumping into Litestep without reading or knowing what they are doing.

READ! Did I mention that yet? READ!

After you read you should be able to figure out what you've done wrong and fix it. Or at least be able to ask more dirrect questions that people will actually take the time to answer.
GL and have fun. If you take your time, you'll probably learn alot more than just being able to use litestep.