Insert your Windows 7 DVD in the optical (CD/DVD) drive. Click Install Now option once you see the screen. If you have disabled autorun, open the root of the DVD drive (Windows 7 DVD) and run setup.exe file. You can also use an USB stick to install/upgrade to Windows 7. Do not get the latest updates for installation. If you have the latest version of Windows 7, then you need not to check for updates. You can select Do not check for updates if you wish to check for updates post upgrade process.