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Wired News: Windows to Power ATMs in 2005

Within three years, most bank machines that dispense cash will run on the Windows operating system, according to a study published last week.
By 2005, 65 percent of bank ATMs (not including free-standing machines in places like convenience stores and casinos) in the United States will use a stripped-down version of Windows. About 12 percent of the machines will use the operating system by the end of this year, according to Gwenn Bezard, an analyst at market researcher Celent.

I saw ATMs running Windows with „Error Memory Read“ Messages on their displays.
Why is this accepted ?
This decision makes no sense to me. As Operating System for a terminal where people check their accounts and make their personal financial transactions you need a stable system. Imagine you make a transaction and suddenly, ooops, ‚Error Memory Read in…‘ appears on the screen. What do you think ?