  We study two-dimensional interacting electrons in a weak perpendicular
magnetic field with the filling factor $\nu \gg 1$ and in the presence of a
quenched disorder. In the framework of the Hartree-Fock approximation, we
obtain the mean-field phase diagram for the partially filled highest Landau
level. We find that the CDW state can exist if the Landau level broadening
$1/2\tau $ does not exceed the critical value $1/2\tau_{c}=0.038\omega_{H}$.
Our analysis of weak crystallization corrections to the mean-field results
shows that these corrections are of the order of $(1/\nu)^{2/3}\ll 1$ and
therefore can be neglected.
