The term "rootkit" has negative connotations through its association with malware.
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A rootkit is a collection of computer software, typically malicious, designed to enable access to a computer or areas of its software that would not otherwise be allowed (for example, to an unauthorized user) while at the same time masking its existence or the existence of other software.
The term rootkit is a concatenation of "root" (the traditional name of the privileged account on Unix-like operating systems) and the word "kit" (which refers to the software components that implement the tool).
Rootkit detection is difficult because a rootkit may be able to subvert the software that is intended to find it.
Detection methods include using an alternative and trusted operating system, behavioral-based methods, signature scanning, difference scanning, and memory dump analysis.Removal can be complicated or practically impossible, especially in cases where the rootkit resides in the kernel; reinstallation of the operating system may be the only available solution to the problem.This tutorial is a short solution if you receive the error 0x80070003 or 0x80070002, when you try to install Windows updates inside Windows 8, 7 or vista.The above error(s) happens when your computer has wrong date/time settings or when Windows update temporary folder is corrupted. Press “Change date and time” to ensure that you have setup the correct date/time/year in your computer. When finished with date/time, press “Change time zone” to ensure that you have the proper time zone. Restart your computer and try to update your computer. Search for Windows Update service, then right click on it and select Stop. Open “My Computer” and navigate to “C:\Windows” folder. Find and right click on “Software Distribution” folder and choose rename.If the problem persists, proceed to the next method. Simultaneously press Windows key + R to open run command box. c: Rename the “Software Distribution” folder to “Software Distribution OLD” and press Enter. Ask “YES” to UAC warning and continue to next step.Step 3: Start Windows Update service, and try to update your computer.