Notification Area not shown

Dear W7-Specialists, I use programs which can only be controlled by the "tray icon". Unfortunately the notification area ist not shown. I set the registry key to

[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer]
"EnableAutoTray"=dword:00000000

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer]
"EnableAutoTray"=-

without success. In the control panel I cannot click on "restore default". "Clock" ist working, but all other system icons are "greyed (blacked) out". The program icons are not shown (cpl) although the programs are running.

How can I get back the notification area?
How can I force the "tray icons"?
If Mr. Redmond does not allow me to display the icons: where can I find them in the system?

thank you very much in advance regards kotnig

Dear pbcopter, thank you for your advice. Changing this value to 1 does not change anything.
Regards kotnig

Dear guy A,
the Reg-modification turned the notification area on.
Thank you very much
regards
kotnig