I have a Dell Studio XPS 16 Myself as you can see from my system specs, and i found that i only had to install 3
drivers manually as the rest were covered by Windows 7 excellent set of base
drivers when i did a clean install to upgrade my OS from Vista x64 to Windows 7 x64. Even the AHCI mode was supported out of the box for my HDD without having to insert any special
drivers into my installation and all relevant chipset drivers (e.g. ICH9 drivers) came preinstalled.
They were:-
1. The ATI Display Drivers, i prefer the newer Cat 10.3s from ATI than the basic WDDMs that Windows installed automagically when i 1st installed 7. Obtained it from their official website.
2. The Ricoh SD Card Reader Host controller. The previous Drivers that Dell provided on their
driver CD sufficed.
3. The Ricoh 1394 Host Controller
driver.
Windows 7 has the best out of the box
driver repository yet, kudos to MS i say. This is how it should be done on all successive Windows editions. I can't imagine the amount of driver searching i would have to do if i wanted to install some legacy OS on this system for kicks (e.g. Windows XP and below)