When you install the new version of Windows, you can keep an older version of Windows on your computer. This is often called a multiboot or dual-boot configuration.

1. insert the installation disc into the computer's CD or DVD drive.
2. click Install now.
3. On the Get important updates for installation page.
4. Type product key.
5. click I accept the license terms.
6. type of installation? page, click Custom.
7. On the Where do you want to install Windows page, select the partition or disk where you want to install the new Windows operating system.
8. Click Next to begin the installation. You might see a compatibility report.