Need Help!Very Important and urgent!

This is my 5 th post i guess and this is very important post,So please i need replys ASAP.A hacker has hacked in my computer and hacked some files.The problem is i cant find my Wireless Wifi connectivity.It is working in my cell,but not in my laptop.This is urgent please help.Please tell me how to protect my pc and get my Wifi connectivity back.
 

My Computer

System One

  • Manufacturer/Model
    Hp Pavilion dv5 Notebook PC
    CPU
    intel core duo 2
    Memory
    2.0 GB (RAM) 139 GB (ROM)
    Graphics Card(s)
    Nvidea Geforce GT 9200
Do you have any system security software?
 

My Computer

System One

  • Manufacturer/Model
    HP Compaq Presario C700
    CPU
    Intel Pentium Dual Core T2370
    Motherboard
    HP 30D9
    Memory
    2GB 677Mhz
    Graphics Card(s)
    Mobile Intel 965 Express Chipset Family
    Sound Card
    Conexant High Definition SmartAudio 221
    Screen Resolution
    1280 x 800
    Hard Drives
    WDC WD1200BEVS-60UST0
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