Windows 7 is the latest Windows operating system, and is successor of Windows Vista. It is available in many editions namely, Starter, Home Basic, Home Premium, Professional, and Ultimate. Features Windows 7 consists of Action Center, which consolidates all the messages from Windows Defender, User Account Control, etc. In case, Windows 7 requires your attention, the Action Center icon will appear in the taskbar. This operating system has the feature of backing up individual folders, libraries, and drives. Its calculator is integrated with new Programmer and Statistics modes. In this operating system, you can easily move and resize gadgets. Usability Windows 7 offers you the facility to perform all your tasks with your fingers, like browsing online newspapers, flicking through photo albums, shuffling files and folders, etc. You can perform an upgrade installation of Windows 7 on your Windows Vista based PC, with the following steps: STEP 1: Turn on your computer and when Vista gets started, do one of the following: a) Insert the Windows 7 installation disc into your computer. Setup would start automatically, if it does not click on “Start” and then on “Computer”. Open the Windows 7 installation disc on your DVD drive, and then double-click on setup.exe. b) If you have downloaded Windows 7, then browse the installation file, and double click on it. STEP 2: Click on Install now on the “Install Windows page”. STEP 3: On the “Get important updates for installation page”, it is recommended to receive the latest updates in order to protect your computer. STEP 4: On the Please read the license terms page, click on “I accept the license terms”, and then click on “Next”. STEP 5: Click on Upgrade, on the “Which type of installation do you want?” page. STEP 6: Follow the instructions to complete installation of Windows 7. After completing Windows 7 installation, you can enjoy with its features like Aero, etc. Limitations While performing Windows 7 installation, you can face a technical error. You may face issues while sharing files between Windows 7 and Windows XP systems.