I searched the Gallery and found no "liteshow".
Give us a link to this skin.
Open your Explorer and under Winstep/backgrounds delete the background. Make sure you didn't try to load a program there, and if you left the .ini file in that "liteshow" folder, get it out.
Don't import the .ini's to Nexus. Use backgrounds only and make sure the files have the same name when you put them together.
In fact, uninstall the Nexus without saving settings and then reinstall after a reboot.
Did you try to load a Winamp skin there? That's the only 'litestep' I found with google.