This happened to me a couple of months ago (like March 2012). I bought a new Dell 3750 laptop and it came with Windows 7. I didn’t want to use this operating system, so I got myself into the task of installing Windows XP and finding the appropiate drivers, which actually cost me quite a lot of time. I looked and looked and participated actively in this forum on Tom’s Hardware:

http://www.tomshardware.co.uk/forum/269597-35-driver-dell-vostro-3750#bas

To cut a long story short, here are two download links for them:

– The full setup files: http://www.hachete.com/files/3750XP.rar

– Just the drivers AS IS:  http://www.hachete.com/files/drivers3750XP.rar

Daniel