Icons not showing in notification area of taskbar

howsoonisnow

In XP pro (with SP3) I have set the following programmes/utilities to start automatically at startup and to always show their icons in the notification area of the taskbar:

• google desktop search
• Mcafee security
• O2 broadband assistant
• Windows defender
• Task manager (run minimised, shortcut in Start:All programs:Startup)

However, the icons for these do not all appear each time - the only one guaranteed to appear every time is McAfee security. However, the relevant programs do appear to have loaded even thought the icons are not shown. I do not use the option of hiding inactive icons.

Is there a quick and easy fix for this?