I'm sorry about the issue. Is your printer currently working with the old computer, if you still have the old computer?
Can you click on Start, thenright-click on Computer, then click on Properties, then check if your System type: is 32-bit or 64-bit?
Did you download/ install the MFDrivers For your correct Windows 7 system type at the Canon website below?
and/or at website:
Please reply at the box below to continue troubleshooting. Thank you.