Bootcamp - Booting via USB??

[dyax]

Heya, I've been having so much trouble lately with this, such a pain gahhh..

Alright so i'm trying to run bootcamp on my mac, as i have no blank Dvd's i'm trying to use my 8gb pendrive. I downloaded my files for windows 7 as an iso, used Windows 7 USB TOOL, but then it says:

Files copied successfully. However, we were unable to run bootsect to make the USB device bootable.

(I've also tried Universal USB Installer, this time with no errors. But when i connect it to my mac, nothing happens........

I Also just tried UltraISO, connected to Mac...started bootcamp assistant, and still it couldn't find the windows 7 on my usb?! This is soo frustrating, what's wrong!

What can be the problem?

I'm doing this off a Windows 7 Enterprise 32bit