First, both of the pictures of the error log refer to "The ASUS HM Com Service failed to start...", which should be referring to something else if it is "ASUS" and not ASRock.
On my different ASRock board, AXTU is installed in: C: Program Files (x86)\ASRock Utility\AXTU
I don't see a AxtuDrv.sys service running on my PC, or a file by that name. Might be different on an Intel system, but...
Any chance you checked the "Auto apply when program start" option on the Overclocking screen, etc? I'm a little surprised that would remain after uninstalling and reinstalling AXTU. Same question for the "Auto run when windows start". Did you restart the PC between the uninstall and new install?
Did you remove or disable a startup entry (Task Manager, Startup, or with another program) for AXTU?
Did you use a registry cleaner that removed a needed entry?
Do you see the ASRock XFastRAM program installed in Window Programs and Features? Were you using that feature?