Game wants to minimise in Windows7

My granddaughter complained to me that she cannot play Mahjong Titans in Windows 7 on my PC. Each time she opens it and starts to play it is ok for about one minute. It is then the icon in the task bar is jumping from side to side. As she continues to play the screen flashes until eventually it minimises to the tray. I have also tried this on my sons laptop and it is the same. On both instances the machines have been upgraded to Windows 7 from Vista. Can anyone help to resolve this as it is irritating and I do not know the answer.

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