Daft thing about all this is that if I had just run "Superantispyware" in the first instance, the By Great Deal thing would have been vanquished and I would have been unaware of YAC.
It was in trying to get rid of By Great Deal manually that I noticed the YAC folder in programs and it caught my attention. It has led to this. I'm still not convinced that YAC is malware but it is certainly a PUP and is able to protect itself.
There is nothing else in the Elex-tech folder, only the YAC folder. There is an application called isafe within the folder and SuperAntispyware does not see it as a threat. Belfrey, thanks for link and suggestions. I'll take a closer look later.