You want to hide all icons in the Notification Area, not just individual ones, so that you will only see the time and date in the Notification Area; no other icons will appear there.
Using the Registry
Figure 5-9. The Notification Area with no icons displayed
One potential problem with hiding all icons from displaying in the Notification Area is that you won't be able to know at a glance which programs are running. This can cause problems because when you install some software, it always launches on startup, even if you don't want it to. If you hide all icons in the Notification Area, you won't know what software is automatically launching. So if you do hide all icons, remember to display them every once in a while, so you can know what's running on your system.
Recipe 5.8 for information on how to hide only specific the icons in the Notification Area