Source :
support.dell Download Dell Inspiron M421R Windows 7 32bit drivers Drivers for Dell Inspiron M421R laptop. all the drivers is support for win7 32bit. There is no driver for video win 7 32-bit, but you can use
AMD driver Dell Inspiron M421R Windows 7 32-bit drivers,softwa.re
Dell Inspiron M421R Application,software Dell Inspiron M421R Audio Driver - Conexant High-Defination Audio Driver for Conexant HD Audio CX20672-21Z download
Dell Inspiron M421R Chipset Driver - Realtek USB 2.0 Card Reader Driver download
Dell Inspiron M421R Input Driver - Dell Touchpad Driver for ALPS Touchpad download
Dell Inspiron M421R Network Driver - Dell WiFi and BT Driver for Dell DW1704 WiFi and Bluetooth download (74)
- Atheros Ethernet Controller Driver for the Atheros 8161/8162 Ethernet download (85)
- DW1901 WLAN/BT MUP2.3 driver download
- Dell Wi-Fi+ BT Driver for Dell Wireless 1703 802.11b/g/n Adapter,Bluetooth v4.0 download
- Atheros Ar8161/8165 PCI-E Gigabit Ethernet Controller (NDIS 6.20), Atheros AR8162/8166/8168 PCI-E Fast Ethernet Controller (NDIS 6.20) Driver download
Dell Inspiron M421R Serial ATA driver - Firmware:Julius(2.5",SATA,3Gb/s,7200,512e) download
- Toshiba MKxxxxGSX HDD FW version GS002D download