Do the Steps below:

1). Start any application, say
Word. Open some large
documents.

2). Press CTRL+SHIFT+ESC to
open Windows Task Manager
and click Processes tab and sort
the list in descending order on
Mem Usage.
You will notice that
WINWORD.EXE will be
somewhere at the top,
using multiple MBs of memory.

3). Now switch to Word and
simply minimize it.
(Don’t use the Minimize All
Windows option of the task
bar).

4). Now go back to the
Windows Task Manager and see
where
WINWORD.EXE is listed. Most
probably you will not find it at
the top.
You will typically have to scroll
to the bottom of the list to find
Word.
Now check out the amount of
RAM it is using. Surprised?

The memory utilization has
reduced by a huge amount.

5). Minimize each application
that you are currently not
working on by
clicking on the Minimize button
& you can increase the amount
of
available RAM by a substantial
margin. Depending upon the
number
and type of applications you
use together, the difference can
be as much
as 50 percent of extra RAM.
In any multitasking system,
minimizing an application
means that it
won’t be utilized by the user
right now.
Therefore, the OS automatically
makes the application use
virtual memory & keeps bare
minimum amounts of the code
in physical RAM.