When I installed ESET, Qihoo 360 was turned off, it will not interfere with the installation of ESET.
If Qihoo 360 causes system damage, then the damage was caused before ESET was installed, so uninstalling Qihoo 360 will not work.
Today I tried it on my laptop (I also uninstalled Kaspersky and installed Qihoo 360), and everything worked fine.
This is so weird