Create Install DVD or USB Flash from Windows 7 Download
Depending on what you downloaded (ISO or .box) and what you have available you can use one of the links below to create boot media. To use the USB flash drive methods your flash drive must be 4GB or larger. You could also buy the install DVD if you want. You might not be able to use the Windows 7 ISO Tool with a MAC.
DVD from ISO - If you downloaded the ISO file use a burning program to make a DVD. You can also use the Windows 7 USB/DVD Download tool allows you to create a copy of your Windows 7 ISO file on a DVD or USB flash drive.
http://store.microsoft.com/Help/ISO-Tool
http://pcsupport.about.com/od/toolsofthetrade/ht/burnisofile.htm
DVD from .box files - If you downloaded the .EXE & .BOX files follow these instructions to make a bootable DVD from the Windows 7 download:
http://www.tomshardware.com/forum/1392-63-windows-upgrade-bootable-guide-having-issues
USB Flash from ISO - If you downloaded the ISO file and want to install Windows 7 using a flach drive:
The Windows 7 USB/DVD Download tool allows you to create a copy of your Windows 7 ISO file on a USB flash drive or a DVD. To create a bootable DVD or USB flash drive, download the ISO file and then run the Windows 7 USB/DVD Download tool. Once this is done, you can install Windows 7 directly from the USB flash drive or DVD.
http://store.microsoft.com/Help/ISO-Tool
USB Flash from Setup Files - WinToFlash is a handy application that will help you transfer your Windows 7 setup from a hard drive or DVD to USB flash in a few steps. With this you can install your Windows 7 from a flash card, USB stick, HDD, etc to your computer or netbook. If you downloaded the .box files extract them first. If you have a 4GB or larger USB flash drive (or external hard drive) and the computer can boot from USB:
http://www.softpedia.com/get/System/System-Miscellaneous/WinToFlash.shtml
Have Questions About Installing Windows 7?
FAQ - Common Windows 7 Installation Questions & Answers