I am guessing you have Windows 7. I am using 64-bit, Windows 7, so I figured I would look for new drivers to download and try installing them.
First, I went to Download Center and found this link: https://downloadcenter.intel.com/Detail_Desc.aspx?DwnldID=23186.
According to the Which file should I download information:
If you have Windows 7 64-Bit:
DRIVERS ONLY: Wireless_16.1.5_Ds64.exe
Next I clicked the download button for Wireless_16.1.5_Ds64.exe.
I accepted the download agreement and waited for the file to download.
I ran the installer and got what looked like a progress symbol that twirled for a while and then disappeared.
When I checked in Windows device manager, I found that my drivers were updated to a newer version. I didn't write down my previous driver version, but I am fairly sure it was dated in 2012. Now I have a driver dated 8/22/2013. So even though I never saw any message, I did get an update to my driver. Any chance you had the same thing happen?
Yes, I uninstalled the Dell package, and ran the file you linked. the laptop found the card, but it didn't enable it, because (and I'm looking at the driver properties window here) "C:\Windows\System32\drivers\vwifibus.sys" is unsigned.
I might have found a way to connect to the internet via network cable, I'll see if that helps in any way.
The file vwifibus.sys is digitally signed by Microsoft*. Have you considered the issue may be related to the operating system itself?
This was indeed very frustrating, I found a workaround.
Simply run the Intel driver auto detect found here: Intel® Driver Update Utility for wireless networking
It will find a slightly older driver than the newest one on Intel's download page, in my case 220.127.116.11 (the file name was 16.1.1 something) that installation worked fine. It got rid of the tethering problem I was having with my Nokia Lumia 920. Intel should really fix the installation program so that it at least tells you the driver is not compatible (although it should be) instead of doing nothing.