After upgrading my version of Windows, why has my antivirus client stopped working?

If you upgrade your Windows operating system from a previous version without first removing your antivirus software, you will likely run into problems. This is especially true when upgrading with a Symantec application installed; the antivirus client will stop functioning, and you'll be unable to reinstall it or install another client. At this time, the only solution to this problem is a clean reinstall of Windows.

To prevent this, completely remove your antivirus client before upgrading Windows.

Note:
For recommendations about antivirus software, see Recommended antivirus software at IU.

This is document avfr in the Knowledge Base.
Last modified on 2016-01-05 00:00:00.

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