taskhostw.exe is a program which is probably legit. So, if taskhostw.exe is on your system, it is probably ok, and will NOT cause problems. Even if your system is virus-free, it is still recommended to run a well-known antivirus with a good detection rate, in order to yourself your PC against threats.
Normally, this program is stored in C:\windows\system32\taskhostw.exe.
The MD5 checksum for this file is c30db833ab9978883fd950b0636e2373.
This program is NOT a Windows service. This is very good.
taskhostw.exe appears to use the functions of Windows SFC (System File Checker) or Windows File Protection.
This is a x64 executable. It uses the full capacity of modern CPUs.
This application does NOT have visible elements of user interface. This is usually a bad thing.
taskhostw.exe is digitally signed. Nowadays most serious software applications are digitally signed.
The digital signature attached to taskhostw.exe verifies as ok. This is most likely a clean, ok program.
Digital certificate name: Microsoft Windows
Certificate's issuer name: Microsoft Windows Production PCA 2011
This program does NOT have a removal routine set up in registry.