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... and the scanner would say: Malicious software found: Windows. Please replace it with anything else...
Is it even possible to "clean" a Windows machine? How far behind are these so called "virus scanners"? Specially these freebees?
If you allow your kids to play with an unsafe computer, or worse yet, with administrative rights, I would imagine that's your problem, not mine. It will certainly teach a lesson, which is the whole point.