I've installed this: LiteStep_Installer_omar_3.0.2_1-79.zip, rebooted the computer, got two error messages: something with error loading taskbar3-0.306_alpha-3.dll and syscolor-2.3.dll modules, and then the mouse stops moving, I see a window that does not finish loading. What should I do to run LiteStep normally?

grab the litestep-updater as well.

Or use LOSI to install Litestep.