There was a thread on this somewhere...just can't find it now. First off you really want to read this page
HERE. That will tell you what LiteStep is and some pros and cons.
You should also read the "LiteStep may not be for you thread" in this section.
Also...if you are an advanced windows user and are afraid of causing problems for novice users you can download LiteStep. There are applications that will switch between explorer and LS if they don't like it, and the user level only applies to installation and maintaining not actual desktop usage.
Then you get the big-ole-warning from me.
WARNING: LiteStep is not for the novice computer user. LiteStep is one of the most powerful applications you will ever use for Windows. If you are afraid of opening a text file DO NOT DOWNLOAD THIS. Be prepared to put in hours of work on the smallest of details. Be prepared to get a divorce or disowned by your family for not spending time away from your computer. LiteStep is just as addicting as the best game you will ever play.