  We study parabolic stochastic partial differential equations (SPDEs), driven
by two types of operators: one linear closed operator generating a
$C_0-$semigroup and one linear bounded operator with Wick-type multiplication,
all of them set in the infinite dimensional space framework of white noise
analysis. We prove existence and uniqueness of solutions for this class of
SPDEs. In particular, we also treat the stationary case when the
time-derivative is equal to zero.
