::: vuaskari.com ::: problem

AOA

If any person read the course CS401 then plz tell me the problem about solving the problem when i write these error are shown

 

Microsoft Windows XP [Version 5.1.2600]
(C) Copyright 1985-2001 Microsoft Corp.

C:\Documents and Settings\guestr>d:

D:\>cd Assembly

"the system cannot find the path specified" this is print on the screen and two files are not created on the assembly folder  
and i can't perform the next work
D:\Assembly>nasm ex01.asm -o ex01.com -1 ex01.1st

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