Right click on the start button (bottom left) and select 'Command Prompt (Admin)' then in the resulting window enter the command:
DISKMGMT.MSC
This will show you the physical drive(s) and how they are partitioned into logical drives such as C:. E: etc.
So my first question is, can I use E: for storage and how? With 191 GB of space, then it is probably available for you to use as you wish. You can rename the drive from 'Save' to a more suitable name using File Explorer. F: should not be touched as it is normally there for repairing problems in Windows.
I know about formating but I also heard that you can't format stock drives inside windows (I mean you can't do it with drivers that came built in). Although Windows should not allow you to format C: where Windows is stored you can format the other drives either from DISKMGMT.MSC or File Explorer.
My second question is, how can I format a drive inside windows without a DVD disk because that DVD player (or whatewer that thing is called that slides out of the PC so you can put a DVD inside) is brocken. See my comment in the paragraph above.
My third question is, what does E:? Did the previous user create it? What may have happened is that C: was originally larger and the previous owner reduced its size using DISKMGMT.MSC and then created a new partition. In the disk management program you can change letters for the logical drives. I haven't tried it for C: as I am not sure what would happen, and changing the letters for other drives may cause existing programs to fail if they expect a file or folder to be on a particular drive and you have renamed it.
Regarding the various files already in E:, I would be tempted to delete them making sure they go to the recycle bin, and then see if anything stops working. If deleting them causes problems then restore them from the bin, otherwise delete them from the bin as well.
In C: if you go to your user folder and then right click on folders such as Documents, Music, Pictures or Videos and select properties on the menu, you should see a location tab. Select the tab and see where the folder is currently located - default on C:. You can select to move the folder to a different drive such as E: and if you want, into a folder on that drive. You will be given the option to let Windows move the files. If you say yes (or whatever the option choice is), then Windows will move the folder and its contents to the new location. This will free space on C:, and will also provide a redirection of any settings in existing applications so that they now use the new location.
I hope this helps.