You can find your computer's name on a Windows PC by opening the "About" menu, and on a Mac with the "Sharing" menu.
You can sign into Google Drive using the same username and password as Gmail, YouTube, and all other Google apps.
You can choose to upgrade to Windows 11 for free if your computer is compatible. You can buy a new PC that already has Windows 11 pre-installed (or opt for an alternative, like a Mac or a Chromebook).