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wifi problemes

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hey everyone.
i started living in a new apartment 2 weeks ago. when i get connected through wifi after a while my computer freezes and i have to restart him. it happens all of a sudden. i checked for viruses and didn`t find anything. i`m sure it`s the WiFi because it didn`t happen before and when i was back at my parents house for a week everything was fine. and today when i went back to the apartment it happened again. when i run diagnostics i usually find that: "problem with wireless adapter or accesses point" but the computer says it is fixed. what should i do? (by the way i have a dell computer and windows 7)

by the way, i ran driver update by dell. after a while my computer does`nt freeze anymore, but i can`t seem to connect at all. it shows only full wifi and the yellow exclamation mark.

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