limited internet access

I just purched two new laptops,toshiba,4 gigabits ram,windows 7. I can connect to the internet,but sometimes get limited accesss,signal strength excellent. Its a real headache for me . Also have acer desktop with windows xp,gateway laptop with windows 7,acer laptop with vista. those never loose connection.any help would be appreciated. i also dont have a lot of knowledge with computers

I really need help here. Please

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