In order to remove StrongVault, you will need to take some additional steps.
First, boot the computer in Safe Mode. When you are in Safe mode, please go to Program files and remove everything that is related to StrongVault.
Then, open Registry Editor (Start > Run > regedit) and navigate to : HKEYCURRENTUSER\Software\Microsoft\Windows\CurrentVersion\Run. Locate Messenger string and delete it. Restart the computer again, and StrongVault is history.