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
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
E-bay
The Kwik-E-Mart (owned by Apu Nahasapeemapetilon) sells Krusty-O's
e-bay
Try e-gunparts.com