Dell only has Vista drivers for this model, although usually the Vista drivers work OK on Win 7.
There is an Intel chipset driver listed on the downloads Drivers & Downloads
and if the chipset drivers are not installed many devices may not work. On most Dell's the install sequence is (1) Install Windows (2) Install Dell Laptop System Software (3) Install Chipset Drivers (4) Install device drivers.
The Dell downloads have drivers for your hardware, as noted USUALLY the Vista drivers will work for Win 7.