Originally Posted by Däs Schmoo
Just drill it. Get a drill bit large enough to get the head out and then remove the rest with vice grips once the rotor comes off. I didn't even use new screws when I replaced the rotor since I had to drill 4 screws out.
I did the same. Here's a little tip I've learned along the way. Before you even try to take out the rotor screw with the impact driver, smack the rotor hat a few times directly above the heads of the rotor screws. This helps to loosen up any corrosion on the head of the screw and the threads. Then use the impact driver to remove the screw.