Hi my name is ***** ***** I will be the expert working with you today to help resolve your problem.
Windows 10 has just been launched on the 29th last month however most of the printer or computer hardware and peripheral companies have not updated there device drivers with windows 10 as they are in the process of developing them.
Please confirm the canon printer model number is ***** Pixma MG3520.
let me know the version of windows 10 you have on the computer is it 32 bit or 64 bit.
for MG3520 you can download windows 10 driver from the link given below.
Driver download click here