I've put in Sonic Adventure 2: Battle, just to see how Gamecube emulation is coming along, however the emulator shows no sign of reading the disk. (I have a DVD-ROM drive, btw)
You can't, silly; there's no way a regular DVD-Drive will read a gamecube disc. And emulation will only be around 4-5 or less fps, so it isn't worth it. Now stop asking stupid questions and look around a little (for example, the faq)!