What does a start menu replacement have to do with the child not liking to touch the screen? Why not just teach the child to use the trackpad or a mouse? Why does that warrant a start menu replacement? That doesn't make any sense....
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Speaking of children and Windows 8. A few weeks ago my 4 year old watched me turn on his new (to him) PC (which btw he has only briefly used my PC before,) login to Windows 8, find the desktop tile, open Chrome from the taskbar, and head to abcmouse.com for him.
Two nights ago the computer was off I forget why. So he asked me if he could play abcmouse.com and I said sure. At first he tripped up on not knowing how to turn on the PC (he just did the monitor) so I showed him the power button on the tower. Next all by himself my son turned on the PC, monitor, waited patiently for Windows to load, logged in, FOUND THE DESKTOP TILE, opened Chrome, and then finally turned to me asking how to get to abcmouse.com from there. I was amazed!
It just blows my mind sometimes about all the people having such a hard time with Windows 8. My 4 year old can use it... no start menu replacement required.