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Internal wireless adaptor

Hello,
i have realtek wireless adaptor in my compaq 621.it is not working properly.sometimes it starts working automatically.i have been with thiss problem for last one year.but for the last weak it is not working ,consistently.i feel like it has problem with it's moving from one place to another.and when i rebbot my pc,before loading os it shows a message indicating"your wireless device is not working ".please tell me what to do.and could anyone tell me how tto open my laptop.it's layers are too compact.give me any video url if you have.......i would appreciate your help ..thanks
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