Network Controller Driver for Dell Vostro 3500 with windows 7 32 bit

Since two year i have been using laptop dell vostro 3500 with windows operating system 7 32 bit. Recently windows got crash. Then i have re installed windows 7 Home premium 32 bit whereby I found network controller driver missing. However i have tried to download from www.dell.com    entering its service tag or product serial number. Though it offers series of drivers after downloading it is never working. Can anyone suggest me to find appropriate network driver.