Reinstall OEM Windows without a OS disk on a Hp PC.
.....the icons didn't show and the start button didn't
show.....
Right click your desktop, select arrage icons by / select Show Desktop icons.
You can manually put Desktop (short cut) icons back on your
desktop if someone deleted them all.
Check your monitor settings for height, is the desktop just
sitting nicely in the monitor frame, when you move you
mouse to the bottom of the screen does the start button and
task bar appear, it may just have hide task bar activated.
1 Just Clean your Machine.
Are you really sure that you need to reinstall Windows.
Often if you do just what Ground Cover said, run some
-antispyware,
-antivirus,
-anti Malware applications
they should clean up you machine.
2 System Restore.
You can try XP OS system restore to take you back to an
earlier date when the PC was working better.
3 Hp PC System Recovery
But if you really want to start from scratch you can.
I have a Hp PC not your model, but they are all very similar
in recovery operations and I have "recovered" my PC right
back to the original factory settings some time ago, its one
dumb way of cleaning the machine but effective, you just
then start out with a brand new machine like it just come
from the factory.
You have to then let windows auto update install a bunch of
updates to Windows XP OS and the machine will only have
the original applications that were installed at the factory, all
will need to be updated. Any applications and DATA that
you or anyone else has put on the machine since it left the
factory are wiped and need to be reinstalled.
Read the Hp help file on the machine it tell you how to do it.
Also look in start menu for;
Start / All Programs / Hewlett Packard / hp pavillion tools / hp pc system
recovery
also
Start / All Programs / Hewlett Packard / hp pavillion tools / hp application
recovery
and read up on what they do, from you Hp help file.
As the other posters have said you have a part of your HDD partioned and
locked its called D: / Recovery
Thats where all the factory settings are hidding, including
OEM Windows XP OS, and original factory installed applications.
Also without doing anything at boot up (starting the machine)
learn how to get into the boot manager start up options,
Malke in this thread has told you how to do this, and note the
recovery options, but don't use it without reading up on what it does.
Once again remember if you do decide to take your machine right back to
factory settings,
-you will lose all data on the machine, so copy anythink you want to CD-R etc.
-lose all applications installed since the machine left the factory
-will have the original OEM Windows XP OS that will need all the MS updates
that issued since the machine left the factory.
-will have original software applications installed by the factory, all will
need updates.
But you will in effect have a brand new machine straight from
the factory, never touched by a customer or anyone.
Remember most people only do this when they buy a
second hand machine or a demo machine from a shop that
the customers have been playing around with.
Have Fun !