Have Avast Look For Malware In This Mac
I have a malware infection on my Mac which has taken control of Safari. Sometimes a search will work but usually I am redirected to other sites such as Mackeeper and The Brit Method plus I get many unwanted pop-ups with no way of closing. Additionally, links from emails to Safari (eg. clicking on a Rightmove email to look at a property) no longer function. I have done everything I can:

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Reset Safari in preferences
Deleted all extensions
Checked Activity Monitor (but nothing looked out of the ordinary)

Also, I have tried downloading anti malware (Avast and AVG) but they then tell me they do not work on my version of OS (10.7.5). I checked for OS updates but I'm told I'm completely up to date. Avast free antivirus for windows 10.
Can anyone out there help?
Have Avast Look For Malware In This Mac Miller
MacBook, Mac OS X (10.7.5)
Have Avast Look For Malware In This Macy's Black
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