This happens when you run some system optimization software or if you are infected with a virus.
If only an individual program is missing, you can choose to fix it manually. First locate the running file for the program, create a shortcut, and paste it under thec:documents and settingsall users"Start menu program .
Put this picture away. expand this picture
If almost all programs are not visible, but they can be searched from the start search box and run normally, it is possible that the related folders are hidden.
Please enter Address "c:programdatamicrosoftwindowsstart menu" in the Address bar.
Put this picture away. expand this picture
Right-click the mouse in the window blank and tap properties.
Put this picture away. expand this picture
On the General tab, check to see if the hidden property is checked. If yes, clear the check, and then click OK .
Put this picture away. expand this picture
Put this picture away. expand this picture
(If pop-up permission confirmation window, please enter the Administrator account name and password, or click " continue ")
Put this picture away. expand this picture