When installing windows you may have many different problems and conflicts are completing a computer failure of your computer's hdd, damaged or old drive too often affects the installation of the operating system. Disc on which the operating system can be worn and not readable in certain places. Recently, an opportunity to do the installation disk image and copy it to the stick. As a result, we do not need to have available a working drive and scratch disk with OSes to install it on your computer. We need only flash drive that we download and install windows on any computer able to boot from usbhdd. Now we have have the opportunity to abandon the portable dvd drive connected via usb connector and the disk operating system. Any installation of windows and setting your computer, and it's drivers and additional software is at least 2 hours. Thus to reinstall windows on a laptop we can be in any convenient place.