Whow - how many weeks have I tried to locate this. Finally I found it - I donīt remember where, but it has helped me out of my problem, hope it will help You
Driverupdate for PaperPort v.3 (mine was 3.0.1), fixing the "Scanner not found" error under win98se and pentium(mmx) cpu. Hopefully, it will fix other systems, but it is the only system Iīve testet it on. Enjoy.