searchui.exe is a program which is most likely legit. So, if searchui.exe is on your PC, it is most likely ok, and will NOT be a cause for concern. Even if your system is clean, it is still recommended to purchase a good antivirus with a good detection rate, in order to yourself your system against potential security problems.
This application is usually stored on disk in C:\Windows\SystemApps\Microsoft.Windows.Cortana_cw5n1h2txyewy\SearchUI.exe.
The MD5 checksum for this program is 8ed88c794234fc7755366e0532471360.
This program does NOT operate as a Windows service. This is usually a good sign.
searchui.exe seems to use the functions of Windows SFC (System File Checker) or Windows File Protection.
64-bit code has been detected. This exe can put to good use the full power of a current computer processor.
The description present in the file is Search and Cortana application.
File version extracted from the file 10.0.10586.63 (th2_release.160104-1513).
Publisher Microsoft Corporation.
Copyright notice © Microsoft Corporation. All rights reserved..
searchui.exe is digitally signed. Nowadays the large majority of legit programs are digitally signed.
The digital signature extracted from searchui.exe checks out perfectly. This is very good.
Digitally signed by: Microsoft Windows
Certificate's issuer name: Microsoft Windows Production PCA 2011
This application does NOT have an uninstall routine set up in registry.