I believe you are referring to anti-rootkit software. Firstly, a rootkit is something that allows other threats (eg. viruses, spyware) to hide themselves. (Rootkits are often bundled with keyloggers or trojans.) Therefore, conventional anti-virus products cannot remove them because they are hidden. Anti-rootkit software is designed to remove the rootkit.
A spreadsheet is software.
software
System software,Programming software,Application software
It is a system software.
They are classified as being applications software.
two kinds of software are system software and application software
Yes,you can categorized software like this.
Yes, software engineers develop software.
software
Application software
Software Theft
Software designed for a specific purpose is called application software or custom software.