Do you see the advertisements with the note Ads By BlockAndSurf while you surf on the internet? And / or you have these two files called BlockAndSurf158.exe and BlockAndSurf_wd.exe in the task manager of Windows? You are infected with adware BlockAndSurf.
You probably set adware Ads By BlockAndSurf on your system unintentionally during the installation of a free-download program. Always be aware of procedures for installing programs and choose publisher sites when you download on the internet.
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