You really shouldn't need to purchase Windows for your e-book reader. Windows is an operating system associated with PCs. E-readers also don't have disk drives to read OS disks. Check your owner's manual for clarification and then search an e-reader retailer that sells books and programs.
Windows 10 caculator cites the value as ... 5.6220098157654597749731354686682 e+7525
You can buy them online or on e-bay.
windows 7 and 8 include burning software for creating CD and DVD disks, earlier versions (XP and below definitely, I'm not sure about Vista) require the use of a third party tool. Nero is a popular choice (because he is Burning Rom(e) geddit?).
Windows key, E, press windows key and hold then E, to open my computer.
The "Windows Explorer " program is launched.
Windows 10 explorer can refer to 2 things: Windows Explorer (file explorer) or the web browser (Microsoft Edge). To find either, click on the Search/Cortana icon (depending on if you have activated Cortana), and search for what you are looking for
E-bay
Hold down the windows key on your key board (the one next to ctrl and alt) and press the Pause/Break key once .This will show you how much ram you have. Press the windows key+ and tap E once then right click on any drive and it will tell you how much space is there in each of those hard disks
The Kwik-E-Mart (owned by Apu Nahasapeemapetilon) sells Krusty-O's
e-bay
Try e-gunparts.com