[header] How to install windows 7 using pen drive [title] Create an iso from your installation disc (if you have one). [step] The easiest way to create an installation usb drive is to use an iso, or disc image, of your windows 7 installation disc. If you have your disc, you can create your own iso in just a few minutes. 
If you don't have your windows 7 installation disc, see the next step. [substeps] Insert the windows 7 installation disc into your dvd drive.