It ain't gone yet...
Spoke too soon. YAC is still lurking. Checked services and there is a service YAC running, set to automatic.
Service name: SafeService
Display name: YAC service
Also gave a path to executable.
I booted in safe mode, disabled the service and rebooted. It still started.
I have a folder in programs, Elex-tech which contains YAC, 52Mb for heavens sake. superantispyware failed to uninstall it.
I don't know the direction I should take with this now.