One way you can run iphone SDK on a PC is Run Mac OS X on it. You can do it easily by using PearPC which is an emulator that can run Mac OS X on it. Just go to this video and he it will show you a complete walkthrough.
Link: http://www.youtube.com/watch?v=XD2F_S-zsuw&feature=related
Uh PearPC was for when Mac was PowerPC only. It doesn't apply anymore!