Emulator Problem: ZX Spectrum emulator

[Paul]

I'm trying to run WonderBoy on EmuZWin the ZX Spectrum but everytime I press OK after clicking the game, my computer freezes. Can anyone help me load the game without causing my computer to freeze? And can anyone tell me how to change the controls on this emulator so I know how to make my character walk, dash, jump, and attack as well? Any help would be appreciated.