Can't boot computer after installing HD 6670

In desperate need of some help here. I've changed my video card plenty of times before and never had an issue, so I'm not sure what needs to be done here.

Computer is a Dell XPS 7100, AMD Phenom xII sixcore, 4 gigs of DDR3 RAM, Windows 7 Home Premium 64 bit. It had a Radeon HD 5450 1 gig card.

We took that out and put in a Sapphire Radeon HD 6670. It of course did the funky weird screen stuff. I plugged in the driver CD, let it run its course, and when it prompted to restart, I did.

It got stuck in a loop of blue screen crashes. I ran diagnostics from boot and the graphics card passed. I booted into safe mode and went to the AMD site, used their auto detect to find the best driver match. It found a newer driver, so I clicked to install it. The catalyst center failed to do something or other. So I went to the properties for the vid card and manually installed the newer driver.

Restarted, and the same thing. Crazy weird blotches and colors all over the screen, followed by blue screen crashes after the "starting windows" screen.

I have no idea what to do at this point. The HD 5450 is already out and installed in the other computer.
 
In case it helps, this is what it says about the system error when I boot into safe mode:

Problem signature:
Problem Event Name: BlueScreen
OS Version: 6.1.7601.2.1.0.768.3
Locale ID: 1033

Additional information about the problem:
BCCode: 116
BCP1: FFFFFA8005B8C010
BCP2: FFFFF880042EE26C
BCP3: 0000000000000000
BCP4: 0000000000000002
OS Version: 6_1_7601
Service Pack: 1_0
Product: 768_1

Files that help describe the problem:
C:\WINDOWS\Minidump\100412-22666-01.dmp
C:\Users\Ashley\AppData\Local\Temp\WER-84630-0.sysdata.xml
 
It's the drivers.

Using Driver Sweeper in safe mode, I removed all AMD drivers. Rebooted into normal mode just fine. Looked at device manager, had an exclamation point by the card, because of the sweep I did. Uninstalled the card.

Rebooted into normal mode, at which point the computer detected the hardware and installed drivers. Let that finish, rebooted, got the BSOD again.

Rebooted into safe mode and did driver sweeper again. Rebooted into normal mode, downloaded latest driver from AMD website, installed it. It finished. Restarted into normal mode, BSOD.

I am at a loss here.
 
Bad card most likely. Can you try the card in another system?

Yes, I can. It would be a huge hassle, but I can! lol

We just took the 5450 out of this computer and put it in the other one and it's over there working just fine. We'll have to yank it out and stick this one in there
 
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