  A program including all radiative corrections to the MSSM at the same level
as the radiative corrections to the SM has been developed and used to perform
global fits to all electroweak data from LEP, SLC and the Tevatron and the
radiative b->sgamma decay from CLEO. Values of the strong coupling constant at
the $M_Z$ scale and $\sin^2\theta_{\overline{MS}}$ are derived, both in the SM
and MSSM. Recent updates on electroweak data, which have been presented at the
Warsaw Conference in summer 1996, reduce the R_b anomaly from a 3.2 sigma to a
1.8 sigma effect. In addition, the $b \to s\gamma$ decay is 30% below the SM
prediction. In the MSSM light stops and light charginos increase $R_b$ and
decrease the $b \to s\gamma$ rate, so both observations can be brought into
agreement with the MSSM for the same region of parameter space. However, the
resulting $\chi^2$ value for the MSSM fits is only marginally lower and in
addition, the splitting in the stop sector has to be unnaturally high.
