I just got an external HD, but i want to transfer EVERYTHING from my current HD's (2) to the external HD. If anyone can tell me how to transfer everything please let me know thanks you.
Did the external drive come with backup software? That's probably the simplest thing to use. Maxtor (and IIRC WD) external drives come with a version of Dantz Retrospect, which works quite well.
If you want a bootable copy of your OS on an external drive, it's not likely to happen - Windows doesn't support booting from USB. Firewire, maybe, but I don't think so.