You can read up on it by clicking the link below.Reboot
your computer into Safe Mode
by tapping F8 until the screen appears where you can use the up arrow to choose safe mode.
Scarlett is right, if you haven't defragged
it can take an exceedingly long time.
Plan on leaving it run while you sleep.
Having begun the process once and exiting
should prove no problem, but you do want it to finish the job.I've even run the defragmentation twice in a row
if it didn't remove all the fragments the first time through.
I didn't have the patience to watch it.
I just looked at the progress every now n' then.
You will notice a marked increase in performance if it's been
a long time.
The GUI (graphical user interface) in win98 depicts the action as a grid
of squares. Each one represents a file.
Windows places files in such a way
that parts of larger files are "spread around the hard drive"
factors that exist in the OS's way of doing things.
Normally it keeps track of where they are
and finds all the related pieces of larger clusters fine.
After a while, the milliseconds that it takes to do that increases.
It can get out of hand over time.
Your computer slows down.
The graphical depiction of your defrag program
will show the "re-writing" and "re-locating" of the files.
After several minutes (or an hour),
you'll notice the little squares at the top will match
a key-color that indicates they are "complete".
The process continues throughout the HD,
placing the newly "re-written & re-located"
files closer to the "front" of the drive
and more organized for faster access.
You'll see all that action, scrolling and reading the information when it runs.
Safe mode is simply windows running the desktop & all the normal icons,
start menu, etc. but not allowing many non-essential programs
For example, limited monitor functions will use only rudimentary display drivers.
Many background programs normally starting at boot will not run.
Internet access is not provided to curtail services & IE requirements.
It is for diagnostics & a more controlled environment to operate in.
It should help you while defragmenting when a large percentage
of your drive needs it.
Read the tutorial and give it a try.
Like jgweed said,
no one wants to steer you wrong.
You simply need to defrag and learn some more things as you do it.