Contrary to popular mis-information, LiteSTEP will never 'require' you to reformat, or to reinstall Windows.
It is a simple executable much like notepad.exe except it provides module-loading capacity to create an alternate GUI functionality to that of Explorer.exe [yet another simple executable].
In XP life is dead simple, as the OS kernel is directly accessible via the task manager enabling the stopping of any errant process, or the starting of such as regedit or, better still, an alternate Shell management proggy for those who might need more hand-holding.
XP can happily run shell-less and therefore GUI-less....though it gets a bit tedious working via Task Manager, it's not impossible at all.
I used to load a shell manager to assist in switching between them but now I can't be bothered...I just kill one process or another.
Sure, you can load a dud theme and end up without a GUI....but that's a minor glitch, not a reason to abandon ship and swear off shells for all eternity.
You should NEVER 'need' System Restore to recover from a bad shell load....talk about overkill...
System Restore is for those who delete their System32 folder or some such in an attempt to save space......and wonder why the comp is only half there.....
In all my themes I include the line in my 'ReadmeFirst.txt'....
Remember....Litestep doesn't kill computers....people kill computers....