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how do I get rid of BrowserDefender.exe, accidently imported with Firefox

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I accidently acquired a malware program BrowserDefender.exe when I downloaded Firefox from the Internet onto my new laptop. All other software loaded by me has been from legal discs, used successfully on our Desktop. My anti-virus software is displaying annoying pop-up messages. I am unable to delete the folders because "one of the files is in use by another program". My ISP tech support people had the same problem.

the beast resides on my laptop in c:\Programdata\BrowserDefender\

I accidently acquired a malware program BrowserDefender.exe when I downloaded Firefox from the Internet onto my new laptop. All other software loaded by me has been from legal discs, used successfully on our Desktop. My anti-virus software is displaying annoying pop-up messages. I am unable to delete the folders because "one of the files is in use by another program". My ISP tech support people had the same problem. the beast resides on my laptop in c:\Programdata\BrowserDefender\

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Your best bet would be to visit one of the forums specializing in malware removal listed in the How do I get rid of malware? section of this article: