AVG TuneUp not doing its job

AVG TuneUp is not doing its job properly as my computer is only 39% tuned up.  My subscription was renewed, and I would like that latest version.  However I don't know how to go about uninstalling the old one and installing the new one.  I did contact AVG and had a painfully slow online 'chat' with someone.  He did say he'd sent me a link, but this was hours ago and needless to say I haven't received it.  Please can someone give me some instructions - suitable for someone who is not computer savvy.  Many thanks
Carolyn

Carolyn, 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!. Also please try to keep the whole conversation in one question/thread to speed up any resolution. Please see your other posting (https://support.avg.com/answers?id=906b0000000DcoZAAS).
AVG Guru

Carolyn, 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!. Also please try to keep the whole conversation in one question/thread to speed up any resolution. Please see your other posting (https://support.avg.com/answers?id=906b0000000DcoZAAS).
AVG Guru