Driver for Windows 7 (32-bit and 64-Bit) are available.
As the laptop comes with 64-Bit version, these drivers are available at Dell Official Site.
Dell Inspiron WLAN (Wifi) Driver for Windows 7 32Bit are not available from Dell Official or Microsoft Update (online).
came accross this issue and solved it by searching 32Bit Drivers
for the WLAN hardware and found the drivers. Below is the link from
Intel Official Support.Intel WiFi Link 1000BGN Drivers
Download/ Install the drivers/ and Enjoy wireless internet connectivity!
From adaptor properties - Advanced, select AUTO for 802.11n Channel Width to experience 300Mbps downlink Data Rate.!!!
Hope it helps! Good Luck!