The video starts by introducing the process of formatting and installing an operating system on a laptop or desktop using a bootable USB flash drive. The presenter mentions that links for creating a Windows bootable USB are available in the description box.

To begin the reformatting process, the video shows how to access the BIOS settings by repeatedly pressing either the 'Delete' key or 'F2' key during startup. This step is crucial for selecting the boot device.

After accessing the BIOS and setting the boot order to the USB drive, the video demonstrates booting from the USB. It then proceeds with the initial steps of Windows installation, including selecting the language and clicking 'Install Now'.

The presenter guides viewers through selecting the desired version of Windows (e.g., Windows 7 Ultimate 64-bit) and then choosing the 'Custom: Install Windows only (advanced)' option for a clean installation.

This part covers managing hard drive partitions, specifically formatting and selecting the partition where Windows will be installed. The video highlights that the installation process will take some time as files are copied.

After the main installation, the video discusses the final steps of setting up Windows and the importance of installing necessary drivers. It recommends using tools like DriverPack or SDI for efficient driver installation.

The video concludes by showing viewers how to check if all drivers are properly installed using Device Manager. This ensures all hardware components are functioning correctly after the operating system reinstallation.