When we started you had a problem with the wireless connection notification.
It was solved.
We then progressed to other icons in the notifications area of the taskbar.
On XP and indeed on Vista and 7, although on the latter two the arrangement is slightly different - what is commonly referred to as the taskbar
may more properly be split into the following arrangement
The Windows XP® taskbar is divided into three areas: the quick launch bar, task button area and system tray, which Microsoft refers to as the notification area. By default the left end of the taskbar contains the quick launch bar, the middle portion displays the task buttons, and the right end holds the system tray.
Dealing with that aspect
The system tray occupies the far end of the taskbar, displaying icons for utility and services that are running. Here you will see the system clock, battery indicator, network indicators, Bluetooth® services, and firewall, anti-virus and anti-spyware icons for programs that are actively protecting your computer. The system tray can also hold optional shortcuts to configurable utilities that are running, like speaker volume and graphics card settings. In Windows Vista® the notification area separates system utility icons from program icons.
The system tray or notification area provides critical information at a glance. You can quickly confirm that your firewall and other protective services are up and running. It might also show unneeded services that are running, wasting valuable system resources. To shut down a service, right-click on the icon and choose "exit" from the popup menu. If the service is configured to run each time Windows starts, the icon will reappear at the next boot.
If you execute a print job, you should see a printer icon appear in the system tray. Should a problem occur double-click the icon to jump to the print queue where you can read details about the error. This is particularly handy if printing through a network where the printer is not visible from your desk. Nobody likes arriving at a printer only to discover the print job needs to be resent!
IF YOU RIGHT CLICK the system tray area, not on a particular icon and then click Customize notifications, or right click anywhere on the taskbar and then click properties. You then see on that window, a small box to check Hide inactive icons and if you then click the customize botton on the lower right of the window that opens YOU arrive at this screen with current icons and past icons.
Each entry when you select it has a drop down arrow, to the right with three options.
WHEN you click Customize notifications - you are then here at this window
the screenshot is from Vista I am using on this computer but the XP window is more or less identical.
IN MY OPINION, as you say you have already tried this procedure, the first step is to remove from the file where they are stored all the past icons.
This will do NO HARM, otherwise I would NOT have suggested it.
THAT ALL SAID
I have spent my time typing out most of this, although some is a copy and paste, as I NEVER like to leave a thread, when in ANY way the person I have been helping, seems a little unhappy with the advice, or the progress of the thread.
I am not in any manner, suggesting that you should NOT have queried my advice - indeed on my signature notes at the end of each post is that specific remark
PLEASE query etc.
HOWEVER having done so if you choose NOT to follow the advice, then there is little that can be done to assist you.
HOPE you get it sorted.