Create a bootable flash drive from an existing Windows 7 disc
If you have a Windows 7 disc:
If you have a Windows 7 disc, and are simply trying to install Windows 7 on a computer without a CD/DVD drive, you will need to use another computer to extract the Windows 7 files. Once you have found another computer, insert the Windows 7 CD/DVD into the disc drive. Windows 7 will likely auto discover and load the installer. If this happens, exit out of the install Windows 7 screen. From there, click the start menu and navigate to Computer.
You should be able to click on your CD/DVD ROM drive. Most likely, this is the D: drive. Double click it to open the Windows 7 install disc. From here, there will be several folders. We will simply copy these files to your flash drive using a utility. Go get the WinToFlash utility.
After you have it downloaded, you will not need to run any type of installer to use it. Rather, create a folder on your desktop and name it Windows 7. Extract all files from the WinToFlash ZIP file to this folder.
After you have done that, go ahead and run the WinToFlash application by double clicking the WinToFlash application icon, located in the Windows 7 folder.
From here, the process is very simple. Make sure that you have the flash drive inserted into an available USB port. Select your Windows 7 install DVD (D:), select your USB flash drive, and WinToFlash will create a bootable USB drive.