Another method that always works for me is to install UltraISO trial version: On File tab Open ISO, on Bootable tab Write Disk Image, Format, Write. Boot under USB or HD's on one-time BIOS Boot menu.
That's has been the most sure fire way for me as well it always makes good bootable usb install disks...or as greg was saying this way will work right click on the iso and open it with ultraiso it should be right at the top of the explorer menu and then follow the rest of gregs commands..
System Manufacturer/Model Number Alienware OS Windows 7 Ultimate x64 CPU I7 Motherboard GA-X58-USB3 Memory 6 x 1.5V DDR3 DIMM sockets supporting up to 24 GB of system Graphics Card GeForce GTX 580 Sound Card Realtek ALC892 codec 2/4/5.1/7.1-channel Monitor(s) Displays NEC Display Solutions E321 Black 32" Screen Resolution 1366 x 768
Keyboard Microsoft Mouse Microsoft PSU XFX Black Edition XPS-850W-BES 850W ATX12V Case Antec Cooling Zalman Hard Drives OCZ Colossus LT Series OCZSSD2-1CLSLT1T 3.5" 1TB SATA II MLC Internal Solid State Drive