Just, doesn't start

Hello, the software did work fine, but recently, a month ago It Just don't Start. 

The message is : 

[Window Title]
C:\Program Files (x86)\Norton Internet Security\Engine64\21.5.0.19\uiStub.exe

[Content]
C:\Program Files (x86)\Norton Internet Security\Engine64\21.5.0.19\uiStub.exe

Unspecified error


[OK]