I can't answer the last question in the first paragraph with conviction so I think we should proceed as though we need to address it ourselves. I'll send you the gpus.txt file as soon as I finish typing this. It goes in your Folding data directory and we're replacing the one that's in there. If your search for that isn't getting you there that would certainly be a reason for no folding going on.
Want to find and get to the data directory in a hurry?
Start
All Programs
FahClient (will expand to a list)
click DataDirectory and the list of folders and files there will likely include gpus .txt) . Just replace it with the one I'm sending.