Well "lena95teacher", if you'll tell me exactly where "geaorgia" is, I might be persuaded to tell you exactly where you went wrong with your Windows installation.
Also, the name of a city or specific geographic location is a proper noun, and accordingly must be capitalized.
The reason you don't have a "D:/" drive, is because you didn't tell Windows to create one. In most instances, "D:/", is not actually a drive per se, but a "partition".
It's generally a spare copy of Windows , loaded by the PC maker, to be summoned in case of a "system restore" becoming necessary.
Windows, by default, installs everything on "C:/".
Partitions may be created on a single hard drive, to facilitate separating data storage from system and program files. This is done to protect data files in case a system restore becomes necessary. The data files might be on "G:/", (not an actual hard drive, but a partition on the same HDD), and only the system drive "C:/" would be overwritten at the time of the reinstall.
Think of a "HDD partition" as something that acts a physical "index separator", that you might use to divide recipes from electric bills in paper storage.