One of the screw stripped while I was trying to remove the front passenger window regulator. Now I cannot get the regulator out.

Oh, forgot to mention that is the plastic clip that holding the regulator and glass, and I stripped the screw. Now I am stucked. Can I use a drill to drill the screw out, is it safe to do so? Am I going to break the glass? Any other way to get that screw out? Thanks