This talk is about which rings can come up as universal deformation rings for representations V of a finite group G over an algebraically closed field k of positive characteristic p when the stable endomorphism ring of V over kG has k-dimension 1. We discuss the case when p = 2 and the Sylow 2-subgroups of G are dihedral, and prove that under some additional assumptions the universal deformation ring of V is isomorphic to a subquotient ring of the group ring WD where W = W(k) is the ring of infinite Witt vectors over k and D is a Sylow 2-subgroup of G.