Doris, Go to the link below and under the letter "N" scroll down to "Notification Area - Icons Disappearing" where you'll find several possible solutions.
e.g. "Disable SSDP and uPNP Services"
"Tip: Volume Control disappears in the Notification Area. Once present, run this edit.
Save Settings on Exit"
I cannot seem to make my sound volume icon stay in my taskbar. I have Winxp on my Gateway laptop. So far, I've unlocked the taskbar, then I went to my control panel and checked the box that said to put icon in taskbar. Then sometimes the icon would appear in the taskbar. Then I would lock the taskbar. Then the next time I rebooted, the icon was gone. Sometimes the icon won't even appear in the taskbar when I put the little check mark where it belongs in the control panel. What am I doing wrong? Thanks.