How can i burn a Windows 7 USB to an ISO? I'm trying to install Windows 7 from a USB onto a bootcamp partition. No working :(

So, I thought I might try and burn the bootable win 7 usb to a dvd or ISO (and then burn that ISO to disk).

How can I do this with my Macbook Pro? I al

Note: I'm using Lion, btw.

Cheers!
The easiest way will probably be UNetbootin which lets you specify an ISO to use and will create a bootable USB drive from it. I've not tried it on Lion but a quick Google says it should be compatible (a 90% of the time it works all the time situation).