If the official site does not provide what you need, these repositories often host legacy drivers: CNET Download for original official packages.
Visit the Canon Support Page to download the latest available Windows 7 32-bit CAPT driver. This is often the foundation for manual 64-bit workarounds. Download Canon Lbp 1120 Driver Windows 7 X64
Finding a working is notoriously difficult. Canon officially discontinued support for this model long before 64-bit operating systems became the industry standard. If you plug the printer in and Windows fails to find a driver, don't throw the printer away just yet. If the official site does not provide what
For readers who need a clear, no-jargon process: Finding a working is notoriously difficult
Canon released a generic CAPT driver for Windows 7 x64 that supports legacy printers including the LBP-1120. Here is how to obtain and install it.