What and why not to remove [Win 7]

[Clanger]

Shell Search
Windows Search.- Needed for Antivirus (Avast and AVG confirmed).

What about Natural Language? "Shell Search - Windows Search - Natural Language - Natural Language 32bit"
at 666.50MB is a prime candidate for removal if its not needed.

 

[Kasual]

What about Natural Language? "Shell Search - Windows Search - Natural Language - Natural Language 32bit"
at 666.50MB is a prime candidate for removal if its not needed.

The title says not to remove, what I'm missing?