And then Vista wouldn't boot, not even in safe mode. It'd load four or five DLLs and then reboot itself again. Thankfully Dan knew exactly where the Vista install DVD was, and the repair utility worked this time (unlike last week when I had to reinstall Vista). After waiting a long, long time, Vista eventually resurrected itself from the dead. Then, I began monkeying with different install options, trying to get the scanner to work. Eventually, installing as admin seemed to get the drivers loaded, but then I hit this screen you see here: the Scanners and Cameras control panel shows the scanner as being installed (and the diagnostics show it as working), but any attempt to use the scanner just threw up an error message that "no scanners were detected." Even more infuriatingly, the Windows Fax and Scan application (one of the much touted features new to Vista) refused to see the scanner as well.
I can only assume that all of the new Fax and Scan stuff is somehow incompatible with my scanner - at least Canon's custom app still works. Great.
At least we finally managed to print, scan, and E-mail the form back to our agent. Total elapsed time: two hours, forty minutes.