Sorry but... Windows 7 help please

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http://crunchbang.org – Sorry about this, but I'm hoping that someone can help me with my wife's Windows 7 laptop.  For some reason it's stopped seeing and connecting to our home network. It can see various other networks in our locality, but not our home one. All other computers, radios & phones connect seamlessly, but this Windows laptop.It's years since I've troubleshooted a Windows machine so I don't have a clue.I've tried rebooting; turning the wireless off & on; manually entering the details. All to no effect. Yet it's seeing other networks! If I plug in a n (HowTos)