Hrmph. Umm... Well...
I will give you the real answer which is simply this. That prompt means that the system cannot find the command interpreter, which is command.com. You have to tell it where to find that file in order to be able to execute any programs. If you create a boot disk from Windows, it will put that file on the disk automatically. Otherwise, you will find it under C:\Windows\system32 in Windows XP.
Real answer?
Command line interpreter
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A
command line interpreter is a
computer program which reads lines of text that the user types and interprets them in the context of a given
operating system or
programming language.
Command interpreters as user interfaces
Command line interpreters allow users to issue various commands in a very efficient (and often terse) way. This requires the user to know the names of the commands and their parameters, and the syntax of the
language that is interpreted. From the 1960s onwards, user interaction with computers was primarily by means of
command line interfaces.
In the 1970s, researchers began to develop
graphical user interfaces (GUIs) to provide an alternative user interface for computers, whereby commands were represented by pictorial operations, rather than as textual descriptions. Since they are easier to learn than command line interfaces, they have become the most common way of interacting with a computer. However, command line interpreters remain widely used in conjunction with GUIs. For some complex tasks, the latter are less effective because of the large number of menus and dialog boxes presented and because of the innate difficulty of representing the underlying task graphically.
Scripting
Most command line interpreters support
scripting, to various extents. (They are, after all, interpreters of an interpreted
programming language, albeit that in many cases the language is unique to the particular command line interpreter.) They will interpret scripts (variously termed
shell scripts or
batch files) written in the
language that they interpret. Some command line interpreters also incorporate the interpreter engines of other languages, such as
REXX, in addition to their own, allowing the executing of scripts, in those languages, directly within the command line interpreter itself.
Conversely,
scripting programming languages, in particular those with an
eval function (such as
REXX,
Perl,
Python, or
Jython), can be used to implement command line interpreters. For a few
operating systems, most notably
DOS, such a command interpreter provides a more flexible
Command line interface than the one supplied. In other cases, such a command interpreter can present a highly customised user interface employing the user interface and input/output facilities of the
language.
http://en.wikipedia.org/wiki/Command_line_interpreter
"The command.com is the command interpreter for MS-DOS and is required for the majority of Microsoft's Operating Systems. Without command.com the computer running a Microsoft Operating System would be unable to boot.
When running
Windows NT there are two versions of the command interpreter, command.com and cmd.exe. Cmd offers additional environment variables than command.com; however, it is recommend if you are attempting to run a MS-DOS utility that you utilize the command.com. To use command.com, click Start / Run and type command."
http://www.computerhope.com/commandh.htm