Win 7 installation disk to usb help

Hey guys,

I'm new at building 'puters and was looking for some help.  What is your preferred method of creating a bootable USB drive for installing windows 7?  I have already purchased the operating system and will have a copy of the disks, so I will need to go with that method rather than online purchase.

Is there a program that is preferred or is it best to do it manually?

Thanks!

http://www.microsoftstore.com/store/msstore/html/pbPage.Help_Win7_usbdvd_dwnTool

you don't have to download windows again as it says in the instructions, you just need to copy it from your disk.