Answer:
Obtain a copy of the Windows 7 installation media (either on a DVD or a USB drive) and a valid product key.
Insert the installation media into your computer and restart it.
Press the appropriate key to enter the boot menu (usually F12 or Esc) and select the installation media.
Follow the on-screen instructions to begin the installation process.
Select your language and other preferences, then click "Next."
Click "Install Now" to begin the installation process.
Enter the product key when prompted, then click "Next."
Review and accept the license terms, then click "Next."
Choose the type of installation you want to perform (typically "Custom" for a clean install), then click "Next."
Select the hard drive or partition on which you want to install Windows 7, then click "Next."
Wait for the installation process to complete, which can take several minutes or hours depending on your computer's hardware and the installation media.
Once the installation is complete, follow the on-screen instructions to set up your user account and customize your settings.
Note: This is a general guide and the steps may vary depending on the computer's hardware and configuration. Also, before installing Windows 7, please make sure your computer meets the system requirements and you backup all important data.
Step-by-step explanation: