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On 10/19/15 found computer was on & a PC Cleanup site was going over my comp 4 what looked like 10 hours. My browser was Moz Firefox & now took over

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Hello, I cam home from work, the computer was logged off from prior evening, however, it was up and running with a PC Cleanup type site I had never seen before running scans! I always default to Mozilla Firefox, but now it defaults to for a search engine and not firefox. What happened? and how can I remove I went to the Control Panel to see about removing the new program and it is not listed in programs. They say virus sites dont detect because it attaches to a already trusted program...but it knocked Firefox out. Your Logo is still avail to click on, but Palikan starts up. I pasted the link below. Please advise and assist. Thank you in advance. Lillie G. C.

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Those type programs like to hide. In e-mails, installers . . . . .

You may have ad / mal-ware. Further information can be found in the Troubleshoot Firefox issues caused by malware article.

Run most or all of the listed malware scanners. Each works differently. If one program misses something, another may pick it up.

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