Thanks for posting.
Have you tried installing the drivers manually? http://dell.to/2w1GWcX
Also, try reinstalling the chipset drivers as well.
By installing it manually, do you mean downloading the driver from the Dell website and installing it? Then yes, I have.
And when you say the chipset drivers, is that the Intel(R) 8 Series Chipset Family SATA AHCI Controller listed under IDE ATA/ATAPI controllers in device manager?
Yes, download the driver on to a usb key, then install it rather than using the download option on the website.