Hi all.
I had this problem for so much time...
Maybe anybody still has run into it...
Pixma connected by lan cable, printing is OK, scanning is OK from scanner buttons, but error 5,157,61 trying to scan from MP Navigator EX...
Gone to "C:\Program Files (x86)\Canon\MP Navigator EX 5.1\" folder and set "run as administrator" for mpnex51.exe file.
Now it is solved!
