I've noticed a problem on all computers on our domain when you go to the Dell driver dowload page. The problem happens when you select the model it gives you the option to select the Operating System, however when you make your selection of the operating system it doesn't refresh the page with your O/S selection.
For example when you first open the page to download drivers for the E6400, it will default the O/S selection to Windows Vista, and when you click the drop down page and select Windows XP, nothing happens.
I've noticed this problem for all models of laptops on the site, has anyone else seen this issue and know how to fix it? I'm guessing it's a problem just on our network.
Referring to your post, I tried to download few drivers and applications for Latitude E6400 and I was able to categorize them based on the operating system. It seems to be working fine. Let me provide you with the link for the same and please try the below mentioned steps. If it doesn’t work please try to use a different internet browser and follow the same steps.