web browsing failure

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I just acquired a second macbook pro, which is second-hand but has been functioning perfectly. It is using OSX Yosemite 10.10.3, as is my older macbook pro.

Yesterday, the newer mac started having problems connecting to webpages, sometimes really slowly sometimes not at all, although i can receive and send email. I can usually bring up a google search list, but cannot then connect to any of the links in the search.

Meanwhile my older mac is connecting without problems so it does not appear to be an issue with my ISP.

I also ran the wireless diagnostics tool, which did not find an issue.

the effected Mac appers to have yahoo re-direction malware installed (which I cant get rid of) .

If i can be directed to good advice, it will be much appreciated

Thanks!
 

chscag

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Your Mac's Specs
2017 27" iMac, 10.5" iPad Pro, iPhone 8, iPhone 11, iPhone 12 Mini, Numerous iPods, Monterey
Download and run the free AdwareMedic program. Download LINK.
 

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