Please Run MVT from the link below:
Restart the computer after MVT completes.
If you still cannot open McAfee Anti-Theft after running MVT, you will need to reinstall the program.
Note: Personal Vaults, and the data stored within them, will not be lost if you reinstall McAfee Anti-Theft. All Vaults will be available after a successful reinstall.
McAfee Online Community Moderator