I guess you are on an Intel based Mac running Leopard?
Your best bet is bootcamp then.
Parallels (and Vmware et al.) is not really an option. I doubt you will enjoy it even in bootcamp. Sorry
Disclaimer: Anyone who thinks "Windows" is the "be all, end all" os needs to read up on Tanenbaum... He more or less predicted the coming "google OS" 10 years ago
