Thanks. My work experience would confirm the 'non-technical user' thought. We're mainly Mac based with the odd PC. The PCs are usually on the brink of death due to crapware that someone thought to install. The Macs seem to avoid this, in part perhaps because to the users are so unfamiliar with the system that they don't try to install the crap.
In this case, OP mentioned Erik's did have an "IT" employee. I'm guessing the IT individual's knowledge did not extend to having dedicated POS machines or understanding the concept of user profiles and group policy/rights. With cloud-based/hosted POS systems now, security concerns don't necessarily stop at one's browsing/computing platform.