Have you tried this:
Right-click the taskbar -> Properties -> in the "Notification Area" section, click the "Customize" button
...and then setting the appropriate icons to "Show icon and notifications"?
+1. Windows 7 hides most tray icons by default. You have to set it to "Show" for it to stay in view. But even when hidden, you can view all the tray icons by clicking on the small arrow just to the left of the tray.