How to delete the win7 notification area icon?

Clearing the icon that has expired in the notification area of ​​Windows7

Some programs will automatically display an icon in the taskbar notification area when running, indicating that it is being executed. In Windows 7, although you can customize whether to display these The program icon, but whether it is a program that is currently in use or a program that has already been uninstalled, will be recorded and persisted as long as it appears in the notification area.

The method of completely deleting these invalid program icons is as follows:
Run "regedit" to open the registry manager. Expand to  HKEY_CURRENT_USERSoftwareClassesLocal SettingsSoftwareMicrosoftWindowsCurrentVersionTrayNotify”
Delete the following key values ​​for “IconStreams” and “PastIconsStream”. Then restart your computer so that the invalidation icon in the notification area will disappear.