Try this..
Install in order:
System Utilities:
R282539 Dell System Software 32 bit (64 bit is R282538)
Chipset:
R292253 Intel Chipset 32/64 bit
R292194 Intel Management Engine Interface 32/64 bit
R292473 Realtek Card Reader 32/64 bit
R292474 Intel Turboboost 32/64 bit
R309746 USB 3.0
Sata:
R292225 Intel Rapid Storage Technology 32/64 bit
Video:
R303143 Intel HD Graphics 32 bit (R303142 64 bit)
R314281 Intel Wireless Display Manager 32/64 bit
R314903 ATI Mobility Radeon HD 6470 32/64 bit
Video_ATI_W7_A10_Setup-G22HG_ZPE ATI Mobility Radeon HD 7450M/7460M 32/64 bit
R305948* nVidea Geforce GT525M (64 bit is R307853)
Communications
CONEXANT_D400-USB-MODEM_DDK3R_A02_SETUP_ZPE.exe 32 bit (CONEXANT_D400-USB-MODEM_RY5VP_A02_SETUP_ZPE.exe 64 bit)
CONEXANT_D400-USB-MODEM_DPP14_A00_SETUP_ZPE.exe 32/64 bit
CONEXANT_D400-USB-MODEM_V4HFC_A01_SETUP_ZPE.exe 32 bit (CONEXANT_D400-USB-MODEM_J6N4K_A02_SETUP_ZPE.exe 64 bit)
CONEXANT_D400-USB-MODEM_2M98F_A01_SETUP_ZPE.exe 32/64 bit
Input
R305170 Alps Touchpad 32/64 bit
Ethernet
R292450 Realtek Ethernet 32/64 bit
Wireless/Bluetooth
BT_Intel_W72_A02_Setup-C72H3_ZPE.exe Intel Centrino Wireless-N 1030/6230 Bluetooth Adapter 32 bit (BT_Intel_W74_A02_Setup-50PWW_ZPE.exe 64 bit) - Variant A
R312222 Dell Wireless 1702 32/64 bit - Variant B
R312280 Dell Wireless 1701 32/64 bit - Variant C
R302518/R304912 WLAN 1502 Card (R311834 64 bit) - Variant D
R311896 Intel Centrino Wireless N-1000/Centrino Advanced-N 6230/Centrino Wirelss-N 1030 (R311898 64 bit) - Variant E
R292249 Intel WiMax Link 6150 (R291975 64 bit) - Variant F
R309696 Centrino Advanced-N 6230 Bluetooth Adaptor/Centrino Wireless-N 1030 Bluetooth Adaptor (R292538 64 bit) - Variant G
Audio
R315254 IDT Driver 32/64 bit
Audio_IDT_W7_A03_Setup-8H18M_ZPE.exe 32/64 bit
Application
R314287 Dell Quickset 32/64 bit
Try the one that i highlighted, it works for me. just search the (R311896)