  We consider an extension of the standard model (SM) with charged singlet
scalars and right handed (RH) neutrinos all at the electroweak scale. In this
model, the neutrino masses are generated at three loops, which provide an
explanation for their smallness, and the lightest RH neutrino, $N_{1}$, is a
dark matter candidate. We find that for three generations of RH neutrinos, the
model can be consistent with the neutrino oscillation data, lepton flavor
violating processes, $N_{1}$ can have a relic density in agreement with the
recent Planck data, and the electroweak phase transition can be strongly first
order. We also show that the charged scalars may enhance the branching ratio
$h-->YY$, where as $h-->YZ$ get can get few percent suppression. We also
discuss the phenomenological implications of the RH neutrinos at the collider.
