To install P5MON:

There is no dedicated setup program but there are only a couple of
simple tasks to perform.

1) Create a directory say C:\P5MON. 

2) Copy the files P5MON.EXE, P5MON.HLP and P5MON.386 into this directory

3) Edit the file C:\WINDOWS\SYSTEM.INI and add the following line
to the [386enh] section:

device = c:\p5mon\p5mon.386

Substitute the correct path if you have place the file p5mon.386 in
a different directory.

4) Reboot Windows. Don't forget this step.

Now you can run P5MON.EXE.