At the factory, the operating system is configured with all the drivers and scripting required for the customer's configuration. Windows® XP has comprehensive support for many items, but the following Dell™-branded drivers and software must be installed for proper operation if the operating system has been removed and reinstalled: 

Dell Desktop System Software 
Intel® chipset drivers for ICH7 systems 
PCI Express® x16 video controller driver 
SigmaTel® STA9220 driver 
Intel 82562GZ 10/100 Ethernet controller driver 
Intel 82573L Gigabit Ethernet controller (Dimension™ 9150 / XPS™ 400 only) 
Drivers for any PCI or PCI Express cards installed