Use Downloads.Dell.com and ignore the Dell Download Manager. For the XPS 8300: [URL]
I need some help ... my Dell XPS 8300 experienced a fatal hard drive crash last week.  I went out and purchased a new hard drive, then Dell Support sent me a copy of Windows 7 to load up on the machine.  I successfully loaded the OS, however all drivers are missing.   Fast forward, I went to a different (functioning) machine and downloaded (onto a flash drive) all the applicable drivers from the Dell site associated with my Service Tag.  I also burned the drivers onto a disk. Here's the question:  how do I load the drivers onto the Dell XPS? The files (on the flash drive or burned cd) are not recognized by the desktop?  
Hard Drive Crash - New OS, Help with Drivers