Yeah..those two screws hold the rotor to the hub. My Dad had issues with his Del Slow rotors and had to dremel them out like 91civicDXdude and use an impact screwdriver to get his off too

Once those screws are out, you should be set. Keep in mind, the wheel really holds the rotors on, so when you re-assemble you don't have to torque the screws too tight..just snug them up with a good screwdriver, and let the wheels (properly torqued to 80-ish ft/lbs.

) do their job of holding the rotors on.
I have put so many damn sets of rotors on this car, it is pathetic (I think I am on #5 or 6 now). I am hoping when I take the car apart to swap the ZC in, I'll find something out of whack that keeps warping my rotors..

- But that also means my screws never sit long enough to get frozen in the hub. I can remove them like nothing now.