Try restarting the computer again. If that doesn't work, I can't help you. It has happened many times to me as well. I am having another problem in that there is a mysterious lowercase "i" icon in the McAfee icon n the taskbar.
Try pressing the F11 key
I have McAfee Security Scan Plus icon on the desktop. I am looking for McAfee SecurityCenter pane. Where can I find that?
First you need to make sure the Taskbar at the bottom of the screen is unlocked. 1) Mouse over the Taskbar and right-click. 2) Look for 'Unlock the Taskbar' in the pop up menu. If you don't see 'Unlock' then the Taskbar is already unlocked. Next, drag the Outlook Express shortcut icon from your desktop to the Taskbar, and release. A mini icon will be created on the Taskbar. Click on the mini icon to be sure everything is working ok. If you want to lock the Taskbar, just follow steps 1 and 2 from above, but choose 'Lock the Taskbar' instead.
From the Start menu, open Control Panel Double-click Power Options Click the Advance tab Click the Always show icon on the taskbar. Click OK
Click the volume icon on the right side of the taskbar, then click the mute speakers icon.
Right-click the icon you want moving, and select 'pin to taskbar'
To move an icon from your desktop to the toolbar, first, click and hold the icon you want to move. Then, drag it down to the taskbar or the specific toolbar area you want to place it in. Release the mouse button to drop the icon in the desired location. If you're using Windows, you can also right-click the icon and select "Pin to taskbar" for a permanent addition.
To pause McAfee, you will want to right click on the small icon in the toolbar. Then choose the pause command. You can also bring up your list of programs, find the McAfee program and open it. Then pause the program.
There is an Gtalk icon in the system tray (Extreme right side of the TaskBar). Right click on that icon and select "Sign Out" option.
The disappearance of the volume icon on the Windows XP taskbar could mean the computer is infected by a virus. It may also be as a result of a corruption of registry settings.
The button is included by default in the Quick Launch menu. Simply right-click the taskbar and select Toolbars > Quick Launch.
This will show you how to turn a system icon on the taskbar on or off.