Yes...

ATMs run on Windows because it works, if it didn't the banks would run something else. In fact, they used to run OS/2, they when a new OS was needed because OS/2 went out of support the OS adopted was Win NT, because it does the job and does it well. It doesn't phone home if you don't want it to and appropriately installed on a secured network it's just fine. If it wasn't the banks would be losing money through ATMs and you know that they wouldn't tolerate that. What would you rather? Your bank runs its ATMs on Solaris or Red Hat and you incur the extra costs for licensing? (Oh, and yes, Red Hat does cost as much, if not more to license than Windows.)