MyPCBackup is malware.
I find it with Conduit, PC Optimizer, RegCleanPRO, SpeedyPC, and several other "utility" applicatio... err malware programs. I run D7 minimum of 20 times a day, every day, and it does not install this for me.
I suspect that either something is being missed that is married to that application, and it is reinstalling, or your customers are installing something that includes it.
Edit to add: I don't use AuslogicsDD, I have a portable version from a few years ago that does not include the addware stuff.