I installed multiple themes but always end up with the same problem...
What happens is after litestep finishes loading the taskbar and desktop show, then shortly after has a error "Could not register taskbar window class." then desktop and taskbar dissappear! I right click desktop, get the menu, if i hover over something in the menu the desktop and task bar appear, but when the menu closes they dissappear again...

How can I fix this?!

Not sure but isn't this one of the typical problems you get after stardock fucks up the system? Got windowblinds or objectdock?