My dell laptop keeps disconnecting from wireless network

i am using my dell laptop with d-link router. it wasworking fine last 2 years. recently it keeps disconnecting from network and it says no network available, whereas thereare morethan 6 network available. is it problem with windows/router/hardware
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More about dell laptop disconnecting wireless network
  1. laptop specs?
    router model?
    does the router work fine with a different device/laptop?
    can the laptop connect to any other network?
    has the laptop recently been dropped?
  2. also: make sure te wireless switch on the laptop is on
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