Wireless router settings?

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New member
This problem came up when i purchased my wireless router DLink DIR-300: My pc is connected to internet via cable (directly from router) and my sister is using wireless connection for laptop. When she has her laptop on I face some connection difficulties on my pc in certain programs e.g. mIRC, some online games such as League of Legends. It does not matter if shes surfing the web or downloading something, all it takes is online laptop.
Any ideas whats wrong with my settings? Because when the laptop is off everything runs perfecto.
 
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