Photoshop :: The Missing TWAIN Connection

I recently purchased a new computer (PC) with a Windows XP OS. I needed to reload Photoshop 6.0, which I was using on my previous computer (Windows 98SE). Everything seemed OK, except that I could no longer import images from my scanner through Photoshop. If I select "import" in the file menu, instead of showing my Canon scanner as the TWAIN destination, it merely shows "annotations."

Now...After encountering this problem, I downloaded and installed the update for Photoshop 6.0 and installed it. I also downloaded from the Adobe site a Plug-In update. This, I thought, would probably fix the problem. And it did...sort of.
I installed the updates as instructed, opened Photoshop, and still my scanner was not showing up.

Then at some point I inadvertently clicked on one of the plug-in downloads mentioned above...a plug-in.dll file. When I did that, Photoshop immediately opened and the scanner was there! So, I created a shortcut to the file on my desktop. If I click on it, the program will open up and I can scan through Photoshop. If I open Photoshop using the regular icon on the desktop, though the program will seem to work normally in every other respect, I does not recognize my scanner.