of what is installed on your system, you could start with the Add / Remove
programs in the Control
Panel. Here you will find a list of installed programs.Since all programs are installed to folders (99.99% of the
time, anyway), you can then attempt to find out how much space is being
eaten up by a program by locating its program folder and viewing the folder
Properties. Please note that this method does not cover installed
system files (such as .DLLs and registry) -- but it will give you a very
*general* idea of installed program file usage.
Option #1: Look at
your Program Files folder
Go to c:\program files folder (or wherever you
install the majority of your programs), and look
what folders are available here. Right click
any folder listed here and select Properties. Windows will tell you how much space is being taken
up by the program (see picture below).
Again -- this will only give you a
* rough estimate * for the installed program size. There are more
files installed elsewhere on your system which are related to the program.

Option #2: Attempt to locate a Program Folder using the Start -> Find
-> Files / Folders feature.
Let's say you have Paint Shop Pro on your system...
--> Search
for "paintshop" or "psp"
Your search should come up
with a few matches.
If the search result is a Folder
Right-click
and select Properties. This will tell you (roughly) how much space is being taken up by the
installed program.
If the search result is a File
If the search
results is a file and the file is related to the program you're searching
for, you'll need to locate where this file is stored on your system so that
you can view its folder properties.
In this case,
right-click the file and select Properties. The Properties will tell you
where this file is located on your computer (see Location: in the above
picture). All you need to do now is
navigate to the listed folder and view its Properties.
Another quick
guesstimate of installed program size
Let's say you have all of your
programs installed to C:\Program Files folder, as most people do.
You could
also view the "total" space being used by all programs installed on your
machine by right-clicking on the Program Files folder. Again, this is
only a ROUGH estimate. There are other files installed
elsewhere on your system for each folder listed in the Program Files folder.
