AVG PC TuneUp 2015.518 cannot be installed

Raymond, Please refrain from carrying out multiple postings on the same subject! You won't obtain an answer to your query any faster! See posting (https://support.avg.com/answers?id=906b0000000D2PMAA0).
AVG Guru

I have now uninstalled 15.0.1001.403 but the Windows Installer Service could not be accessed.This seems to be a problem for AVG since my Windows 7 using Google Chrome uses all other programs.Please help,or refund my subscripting to AVG TuneUp.
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Raymond, Please refrain from carrying out multiple postings on the same subject! You won't obtain an answer to your query any faster! See posting (https://support.avg.com/answers?id=906b0000000D2PMAA0).
AVG Guru