thx again all.
I succesfully managed to uninstall litestep (i printed all possible tutorials before doing it hehe)

One thing i have to say though:

the uninstall instructions (on registry editing) are mostly different in each tutorial.
Even on the same site as shellfront.org (check the lsfaq vs de lsdocs)

But it worked, and now time to set up the latest version with the latest installer.

Thx again (i'll give you all a personal theme 2morrow morning):)