You can install Windows 7 on your computer using the Windows 7 installer instructions provided in this free lesson.
An external DVD drive will be needed for disc installation to a Netbook or PC without a DVD drive.
You should now be ready to install the Windows 7 operating system. Due to the variety of installation circumstances, we will direct you to the Microsoft tutorials for detailed instructions.
Once again, you may want to use a computer service professional to perform a custom (clean) installation.