applications disappeared, dock has question marks instead of icons

Applications disappeared from the hard drive, question marks are in the dock for the most part disappeared instead of icons.  I also note that Intego X 9 virus check cannot perform an audit on the hard drive.  I ran disk utility and checking the material.  No noted problem.

I had two days before this program installed the last Intego, (X 9) Virus Barrier app.

iMac late 2013, 27 ", i7 - 3.5 Ghz, Yosemite 10.10.5, 24 GB memory version.

Do you have any suggestions as to why this happened and how to avoid it in the future?

My intention is, if there is not a known reason or fix for restore from time machine, as indicated in my initial search of the internet this is a rare event and Apple has no solution.

Thank you

Graham

Presentation of the material:

Model name: iMac

Model identifier: iM

Uninstall Virus Barrier according to the instructions of developers and restore your time Machine before installing the software AV. Do not reinstall.

Tags: Mac OS & System Software

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