if I turn off all programs but leave my computer runnning ,I receive
messages titled messanger service. What is this? The messages are
nothing I want. This has been going on for 1bout 14 days. I have a
Dell computer with xp sysate. Thenak you

This is a problem that has been cropping up recently. What it stems
from is that some people are using a program known as winpopup to send
you messages. It is easily disabled. Instructions on how to disable
it, along with easy to follow pictures, is available here [
http://www.lantalk.net/disable_messenger.php ]

Naturally, once it was realized that people could send anyone messages
through this, unwanted spam messages proliferated. A bit of
information on winpopup spam is located here: [
http://www.lantalk.net/winpopup_spam.php ], which I quote:

"A new breed of pop-up ads is appearing mysteriously on Microsoft
Windows users' computers. The so-called "Messenger spams" have
security experts and system administrators scratching their heads --
and recipients fuming.
Some of the ads, which hit Windows systems through backdoor networking
ports and not by e-mail or Web browsing, appear to have been generated
by Direct Advertiser, a $700 software program developed by
Florida-based DirectAdvertiser.com ..."

It goes on to say "Winpopup spam works via NetBios protocol ( over
TCP/IP ). When you block 137, 138 and 139 port in your Firewall
software / Firewall hardware, for outside LAN addresses - you'll block
winpopup spam."

So, you can either disable messenger as shown above, or block this out
with a firewall.

If either of these methods do not work, or anything is unclear, please
request a clarification before rating this answer so that I may
improve my answer to meet your needs.

Research strategy:

://www.google.com/search?hl=en&lr=&ie=UTF-8&oe=UTF-8&q=%22messenger+service%22+winpopup