  We compute radiative corrections in five and six dimensional field theories,
using winding modes in mixed momentum-coordinate space. This method provides a
simple way of finding UV divergencies, finite corrections and localized terms
when the space is compactified on orbifolds. As an application we compute the
finite piece of scalar masses, the logarithmic contributions to the couplings
and the effect of localized parallel and perpendicular kinetic terms. We apply
it to get a two loop effective potential that can stabilize large extra
dimensions.
