DEFINITIONS:
ADDRESS (PATH): A numerically described location of a particular bit or group of bits, (byte, cluster, file), a computer OS uses to store, locate, and retrieve a particular piece of information.

DIRECTORY: A graphic depiction of the addresses of every piece of information stored in a Windows OS. Major divisions of the "DIRECTORY" are represented by "FOLDERS", little yellow filing-folder icons having a "Heirarchy" or system of governance comprised of "LEVELS".

In a given "FOLDER" any "SUBFOLDERS" will apear first and individual "FILES" will be shown after them in the display window. To access the "DIRECTORY", right click, either on the "Start" button in the lowest left hand corner of your Desktop screen, or "right click" on the Desktop Icon named "My Computer". In either case, select the "Explore" option. This will open the "WINDOWS EXPLORER", a new screen that is a part of and tied to "Internet Explorer" or IE for short. IE is a "Browser", and will "explore" the world wide web, (Internet). "Windows Explorer" is also a "Browser" but is used to explore the INTERNAL STORAGE of your computer, not the internet.

Once you have the "DIRECTORY" open, look up on the 2nd menu bar on that screen. You will see a button labeled "Folders". Click that button and the "DIRECTORY" or "Windows Explorer" screen will divide itself into left and right panes. In the left pane, locate the heirarchical tree display of folders with small + or - signs immediately in front of the folders. These are used to open or close the folder they are attached to. Clicking on a folder in the left pane will display all the "SUBFOLDERS" and "FILES" contained within that "FOLDER", in the right pane. To view "FILES" contained in any "SUBFOLDER" it is necessary to click to "focus" on the subfolder you wish to look into.

FILE: An single item recognised by a computer to use for processing information of some type. Every file should have a "FILE EXTENTION" name on them such as (dot) .exe / .ini / .bat / .txt / .html / .jpg / .wma etc. These "file extensions" tell the operating system which "PROGRAM" to use to activate that file. You can find out which file extensions are associated with which programs at:
File Extension Lookup [filext.com]

FOLDER: A yellow, (Windows OSes), container in a computer filing system, named and holding any number of individual "FILES".

LEVEL: In Windows Filing Systems, there are many "LEVELS" of folders, each can be contained within another "FOLDER" just like a series of Russian Nesting Dolls. In Windows OSes, the practical number of "levels" of "subfolders" that can be "seen" by the OS, is 8. The total number of characters in an entire address or "PATH" name that can be read is 256. Using long folder names can cause a conflict in reading the total address of a deeply buried subfolder or file, the number of characters in the "STRING" will add up to more than 256 even if there are less than 8 subfolder levels. It is advisable to use short decriptors such as "IE" for Internet Explorer when naming files and folders. many setup file names have this characteristic.

PROGRAM: A group of operations, information, commands, and libraries which make up a useful working computer action.

STRING (PATH): For this purpose, the word "STRING" means the ENTIRE address "PATH" name of a location in the Windows Directory. An example of a complete address "String" or "PATH" name on the storage drive D:\ :

D:\Saved Setup Programs\Chat Progs\Clients\Yahoo!\Yahoo! plugins\YahSeek\YahSeek v2.0.13\(here is where the actual YahSeek v2.0.13 setup "FILE" will reside)

As you can see, there are 9 colors, meaning 9 "levels" of folders in the address "PATH", (including the D:\ drive or TOP LEVEL FOLDER), The actual file in red, YahSeek, is buried so deeply, Windows MAY not be able to find it. I suspect it would, the "string" being less than 256 characters, but it MAY NOT! In this case, reducing the number of folders to this:

D:\Saved Setup Programs\Chat Progs\Clients\Yahoo!\Yahoo! plugins\YahSeek v2.0.13\(here is where the actual YahSeek v2.0.13 setup "FILE" will reside) by removing one sublevel, (\YahSeek), would assure that Windows COULD see it.

I often use "save page as" to save the original download page, (for later info lookup), in the same subfolder as the version itself. Microsoft updates is PARTICULARLY notorious for having many subfolders to keep n00bs from copying their pages. The dirtbags caused me no end of trouble when I go to burn a copy of the web page for someone later, some having 5 subfolders or more. It's their own fault, if they hadn't stolen Sun Java and added a buttload of stuff to conceal the fact it was stolen Java, they wouldn't need 3 extra levels of applets to make VM work.

You can rename a web page as you download it, not as easy after it's in the machine, then you have to reopen, click File> "save page as" & and rename it.
Generally the naming string doesn't exceed 6 levels, so windows can see all of them. 8 Levels is BAD, stuff gets invisible and you have to move it uplevel to open it. Time to make a new catagory if that happens.

SUBFOLDER: A "folder" residing inside the address or location of a higher level of "folder" in the "Windows Directory". The term "SUBFOLDER" is relevant to the folder being discussed in context with the NEXT HIGHER LEVEL "FOLDER" only, there can be many levels of folders and subfolders but the term subfolder would become unweildy if more "sub" prefixes were added. e.g. sub-sub-sub-subfolder.