system
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Here is Avast FAQ on this subject: http://www.avast.com/faq.php?article=AVKB11#artTitle
…BEST site with EXEs already there for download: https://docs.google.com/document/d/1k_GS_9sETRJHgKveyvov27Qb2-85DbbWDF0XwW1OaU8/edit?pli=1
…another site for uninstaller links: http://singularlabs.com/uninstallers/security-software/
…3rd party option: http://www.appremover.com/
…another…http://www.ache.nl > malware > remove (old) av
AFTER the above cleaning of "remnants’ I also use/run CCleaner…it is very easy & reputable to remove temp files, etc. It even has a registry cleaner that is one of few that is safe. The nice thing about CCleaner is you can run it instead of Empty-Recycle-Bin…very easy, quick: https://www.piriform.com/ccleaner
I’d also install MalwareBytes Free and run scanner and remove any PUPs…maybe something else or something sticking around.
https://www.malwarebytes.org/free/