Latest Wireless network driver SLOWED my Internet speed!

pfs3w

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I am having a confusing time trying to figure out why my internet went from 10+ Mbps down to <1 Mbps after simply downloading a wireless card driver.
From the beginning:

My wireless download speed was 10+Mbps, and I was using the Dell Wireless 1505 Draft 802.11n WLAN Mini-Card. This information is found in the Device Manager, under "Network".
The driver for the card was 5.30.x.y (I can't remember the specific version number, but I do remember it was 5.30.something.something). Upon navigating to the Dell webpage, I wanted to see if there were any drivers for the same wireless card that were more updated, to perhaps increase performance.

I navigated to the page for my computer (Dell Latitude D830), here. That page is for my model laptop. You'll notice that, in the drop down for "Operating System", there is no option to select Windows 7.

Regardless, I navigated to the driver under "Network", the Dell Wireless 1505 Draft 802.11n WLAN Mini-Card, and downloaded it. It was version 5.60.188.1, from 11/9/2009. This is where my problem began. After installing the driver and rebooting, my internet speed instantly went to below 1 Mbps. I have no clue why installing a later wireless card driver would mess up my speed.

My only hypothesis is that the driver I downloaded is only compatible with Vista. Do I just re-download driver version 5.30.x.y or something to get it back? Why did it get so slow?

How do I get my computer back to the download speed it was/should be?
 

My Computer My Computer

At a glance

Windows 7 Ultimate 32bit
Computer Manufacturer/Model Number
Dell Latitude D830
OS
Windows 7 Ultimate 32bit
Perform a System Restore to a point before you installed the driver.
 

My Computer My Computer

At a glance

Windows 7 64 Bit Home Premium SP1i7-3820GSkill F3-14900CL9Q - 16GBEVGA GeForce GTX660 - Driver 352.86
Computer type
PC/Desktop
Computer Manufacturer/Model Number
Home Built - Jan 2013
OS
Windows 7 64 Bit Home Premium SP1
CPU
i7-3820
Motherboard
Asus P9X79-PRO - Bios 4608
Memory
GSkill F3-14900CL9Q - 16GB
Graphics Card(s)
EVGA GeForce GTX660 - Driver 352.86
Sound Card
On board Realtek ALC898
Monitor(s) Displays
Acer S271HL
Screen Resolution
1920 x 1080
Hard Drives
#1- Samsung 840 Pro Series
#2- Western Digital WD1002FAEX Sata3 Black
#3- Western Digital WD1002FAEX Sata3 Black
PSU
Corsair CMPSU-850TX-V2 - 850 watt (by Seasonic)
Case
Corsair Obsidian 550D
Cooling
Standard 3 120mm case fans, Cooler Master Hyper 212 EVO
Keyboard
MS KC-0405
Mouse
Intellimouse 5-button
Internet Speed
56 Mbits/Sec (on a good day)
Antivirus
Avast & Malwarebytes
Browser
Firefox
Other Info
Asus DVD - DRW-24B1ST 24X
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