I have a 2003 corrolla le and everytime I hit the brakes the car vibrates very bad. I figure that its either worn pads or a warped rotor. So I buy new rotors and I try to install them and I cant get a socket that fits on the nut that connects the rotor to the axle shaft. I tried a 34 mm but it looks like its a standard nut. Anyways if anyone can let me know what size socket I need to remove this I would be greatly appreciative.Thanks.

Could be your calipers. This can be caused when the back pads are sticking. If the back pad is worn much more severe than the front pads.... the calipers are a likely suspect.

Try to measure the nut and that will help you find a socket that will fit the nut....I don't know if it looks like a normal nut a 35mm should fit it, but it could be slightly off.