New malware appears every day, often from sources we do not expect. Web sites can infect our computers just as well as torrents and email attachments

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Scan Web Sites for Viruses and Malware
There are adaptive malware programs out there that can elude even the most thorough of virus and malware scans. If you find yourself infected with a virus that just will not die, before formatting your hard drive, try Norton Power Eraser .

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Erase Stubborn Malware and Viruses with Norton Power Eraser
We can all agree that malware is a frustrating problem. Deleting these quasi-viruses is an annoying endeavor under the best of circumstances. Even our favorite malware removal tools, like Malwarebytes, can be completely eluded if the malware processes are already running when the tools try to delete them

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Delete Malware Thoroughly with Rkill
The term rootkit or root kit originally referred to a maliciously modified set of administrative tools for a Unix-like operating system that granted root access. If an intruder could replace the standard administrative tools on a system with a rootkit, the modified tools would allow the intruder to maintain root access over the system while concealing these activities from the legitimate system administrator

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What is a rootkit in Windows?