Greetings OrlandoE,
Given your example you are making two folders. One name DOS and a second
one named LABS. Type DIR at a command prompt and insure that those are
indeed the folder names that were created. Your RD command in the
example will work provided the folder names are correct.
The better choice, at this point, would be to locate those folders using
Windows Explorer, determine the problem, delete the folders and begin anew
at a C:\ prompt. Remember to use double quotes around folder names that
have spaces as Lemonilla pointed out. Example: "DOS LABS"
Best wishes!