You can find answer to your question together with your another post here https://support.avg.com/answers?id=906b0000000DbOI .
Please try keep whole conversation in one question/thread to speed up resolution.
Any idea what the cause of the error is and how to fix it? It prevents me from installing PC Tune Up with AVG Zen…The Internet Security runs without problems in the free trial version with Windows 8.1 (x64 proc).
Paul, Also in future please refrain from carrying out multiple topic postings on the same subject! You won't obtain an answer to your query any faster!.
AVG Guru
You can find answer to your question together with your another post here https://support.avg.com/answers?id=906b0000000DbOI .
Please try keep whole conversation in one question/thread to speed up resolution.