To install Windows 7 using the Upgrade option

1. Turn on your computer so that Windows starts normally. (To perform an upgrade, you can’t start, or boot, your computer from the Windows 7 installation media.)

2. After Windows has started, do one of the following:

   • If you downloaded Windows 7, browse to the installation file you downloaded, and then double-click it.

   • If you have a Windows 7 installation disc, insert the disc into your computer. Setup should start automatically. If it doesn’t, click the Start button , clickComputer, double-click your DVD drive to open the Windows 7 installation disc, and then double-click setup.exe.

   • If you’ve downloaded Windows 7 installation files onto a USB flash drive, insert the drive into your computer. Setup should start automatically. If it doesn’t, click the Start button , click Computer, double-click the drive, and then double-click setup.exe.

3. On the Install Windows page, click Install now.

4. On the Get important updates for installation page, we recommend getting the latest updates to help ensure a successful installation and to help protect your computer against security threats. You need an Internet connection to get installation updates.

5. On the Please read the license terms page, if you accept the license terms, clickI accept the license terms, and then click Next.

6. On the Which type of installation do you want? page, click Upgrade to begin the upgrade. You might see a compatibility report.

7. Follow the instructions to finish installing Windows 7.

Credit: Microsoft