Avast Free Antivirus
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Full user review
"Very annoying and intrusive."
Avast! probably works well at detecting malware and it's free. It found a virus in Time Machine that replicated the virus backup 50 times. Avast! allowed me to find them but would't allow batch delete so I used Time Machine to delete them.
Very annoying interruptions.
Scans of volumes take many hours - 60+ in scanning Time Machine - and slows my computer down to a crawl..
I've download Avast! twice and , after a day or two. I deleted it. I'm sure it does a good job but it's too much bother.