atieclxx.exe is a program which is probably NOT a virus or malware. So, if atieclxx.exe is on your PC, it is probably ok, and will NOT be a cause for concern. Even if your system is virus-free, it is still recommended to use a good antivirus with a good detection rate, in order to yourself yourself against potential security problems.
Usually, this application is located in C:\Windows\System32\atieclxx.exe.
The MD5 checksum for this program is 23d0ce89d5a6c87dfa023839fe7f4c37.
This application is NOT registered as a Windows service. This is good.
This is a 64-bit executable. It runs using the full capacity of nowadays' CPUs.
This file does NOT have visible elements of user interface. This is most likely a bad thing.
atieclxx.exe has a digital signature. Nowadays most clean programs are digitally signed.
The digital signature extracted from atieclxx.exe verifies as ok. This is excellent.
Digitally signed by: Microsoft Windows Hardware Compatibility Publisher
Certificate's issuer name: Microsoft Windows Hardware Compatibility PCA
This program does NOT have an uninstall routine set up in registry.