[en] The self-energy and vertex blocks that enter in the Higgs-Higgs amplitude in the fourth order of perturbation theory in the framework of SU(2)LxU(1) gauge theory with an arbitrary number of fermions are calculated. The form of the corresponding counter terms is found. The calculations are done in an unitary gauge. The renormalization scheme is analogous to that suggested by Sirkin. 12 refs.; 14 figs