Are you running 95 or 98 there? When opening a dos window while in Windows you first come to the root of there "C:\Windows>" prompt. To go to the root of the drive you simply type "cd\" and press the enter key. "cd = change directory" "\ = root or top directory" is how that works.
To go from the root into the Windows folder in reverse you would type "cd C:\Windows". For getting into a subfolder you then add the \ along with the subfloler's name such as "cd C:\Windows\system".
You couldn't find basic dos commands as a search term?
Basic Dos Commands EasyDOS Command Index Basic overview of MS-DOS commands.
There's a ton of other links that could easily be added to the list. MSDos then Windows 1.0 then 3.1 and 3.11 and finally 9X still saw dos commands and a shutdown to dos mode over a good period of years there.