Windows 7 Notification Icons Problems

From: http://www.fixitjim.net/2012/11/fix-corrupt-or-blank-windows-7-system.html

1. Open Regedit via Start-->Search
2. Open Task Manager via CTRL-ALT-DEL
3. Find Explorer.exe in the list and end the Process
4. Go back to Regedit
5. Select HKEY_CURRENTUSER
6. Click Edit-->Find
7. Search for IconStreams Or navigate directly to HKEY_CURRENTUSER\SOFTWARE\CLASSES\Local Settings\Software\Microsoft\Windows\CurrentVersion\TrayNotify\
8. Delete IconStreams
9. Search or navigate to PastIconStreams
10. Delete this key as well
11. Hit CTRL-ALT-DEL
12. Start Task Manager
13. Click File-->Run
14. Type, Explorer.exe
15. The issue should be resolved.

This link also has same solution: https://community.spiceworks.com/how_to/36510-how-to-fix-blank-system-tray-icons