Alj1874

My VPN has disappeared suddenly from settings. I tried to uninstall and reinstall with no success.

Hi alj1874:

What is the name and version number of your VPN software as well as the operating system of your computer?  Do you currently have any Norton security program(s) (e.g., the "new" Norton 360 Standard that comes bundled with Norton Secure VPN) installed on this computer?

If you are asking about a Norton product like Norton Secure VPN for Windows (previously known as Norton WiFi Privacy) we can ask the Forum Moderators to move your question to a better location.  Please note that there are several users currently reporting problems with Norton Secure VPN in the Other Norton Products board - see dpic44's 10-Feb-2019 thread VPN Not Starting After Reboot for one example.
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32-bit Vista Home Premium SP2 * Firefox ESR v52.9.0 * Norton Security Deluxe v22.15.1.8