OK so finally an update on this.
Removed all printers / scanners
Removed all registry entries that mention Brother, Pentax, PocketJet
Ran CCleaner, forgot to untick logs so they all went goodbye.
Reboot
Redownloaded driver fresh off Brother's website
Started following directions step by step with their auto-installer. Basically wait until they say so, then plug the scanner in, let it install, and done. Wellllll, same thing as last time, it tells me to plug the scanner in, I see the 'new device found' balloon pop-up recognizing it as a Pentax PocketJet3Plus (as it should), but install then fails. I can't get past the next step on the auto-installer because the Next button does not light up, leading me to believe that there's another error when installing the drivers (hence them failing).
Took a look in event viewer, and found three entries. USB support installed with status code of 0x0 (guessing that means successful), and two with 0x2. See attached images below:
Sorry if those screenshots are hard to read.
When trying to manually install the driver, in device manager, I select the folder containing the driver, and it comes back failing, stating it "cannot find the file specified". Upon going into event viewer, the same two events as shown above show up.
Am I missing something here? Same model laptop this thing installs just fine. We even tried with two different printers of the same model; no luck.