How To Disable the System Tray in Windows Vista

Open Registry Editor and navigate to:HKEY_CURRENT_USER \ Software \ Microsoft \ Windows \ CurrentVersion \ Policies \ Explorer.

In the Registry editor window,check if the DWORD entry NoTrayItemsDisplay is already available in the left panel.

if the DWORD entry NoTrayItemDisplay available,change the value of NoTrayItemDisplay to “1″if don’t have system tray icons.

If the above DWORD entry,NoTrayItemDisplay not exixts,create a new DWORD Value by right-clicking and selecting new DWORD or clicking Edit, then New, then DWORD

Name your DWORD Value NoTrayItemsDisplay
Then create NoTrayItemDisplay entry and set the value of the key as "1".

After completed the tweaking of the Windows registry, restart the computer then you will see the effect that all system icons tray will be hidden. To remove the registry hack, just delete the created registry key NoTrayItemDisplay, or change the value of the registry key to "0".Note that disabling the Windows Vista system tray doesn’t actually prevent system tray applications from running, it just hides them. You should still disable any system tray running applications that aren’t needed.Note that the same registry key may exist in more than one location, so if you are trying to reverse this windows registry hack, you should search the registry for the key NoTrayItemsDisplay.