Here is the Windows 7 version for your FireGL V3400 GPU card from AMD Support: https://support.amd.com/en-us/download/workstation/legacy?os=Windows%207%20-%2064&rev=8.583 .
Unfortunately, your card is considered to be legacy and the last AMD Driver for this card supported by AMD is from 2009. You can download from the above link.
The latest for the Firepro and other professional GPU cards is here: Detail .
But I don't know if the drivers for the FirePro will work on your FireGL GPU card or not. It is for Windows 7 also.
Could there be a way for me to edit the .inf file for it to work?
A link to the Windows 7 driver was provided above. Why are you installing the Vista driver ?
The driver provided is a Vista driver, not a Windows 7 driver since a Windows 7 driver doesn't exist.
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Click on the link.
AMD Catalyst™ Display Driver
Windows 7 64-bit
NAME FILE SIZE REVISION NUMBER RELEASE DATE DOWNLOAD LINK ATI FireGL/Pro/MV Software Suite Multilanguage 88 MB 8.583 4/8/2009 *DOWNLOAD
You can click on the copy from the AMD Support from this Post to Download the WIndows 7 Driver.
Sorry, You are correct. I clicked on the "Download" button and the name of the File was for VISTA. This means the VISTA and Windows 7 should work the same.
@ray_m or @fsadough :
This is the file that is downloaded from the Windows 7 AMD Support site:
When you try to install the VISTA Driver, under "Properties" - "Compatibility" change it to work with VISTA instead of WIndows 7 and see if it installs successfully.