I have used the free programs of the following for the past few years:
I don't have a Mac. I have Mozilla Firefox and Win8.
Some of these may be useful to you. Just be aware when installing, as some also include a link to Google Chrome.
Just uncheck the box for Google Chrome unless you do want that as well.
Malwarebytes Anti-Malware
SuperAntiSpyware free edition
Wise Registry Cleaner
CCleaner
JRT-New
Revo Uninstaller
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