Hi zCanon,
You can download and install drivers and software for your printer by following the steps below.
1. Visit Canon's website at: http://usa.canon.com/support
2. Type MF4350d in the "Enter a Model Name" box and click Search.
3. On the Support page for your unit, click the 'Drivers& Downloads' link.
4. Select "Operating System"
5. Under the "Drivers" tab section click on the file named [Windows 64bit] imageCLASS MF4350d MFDrivers (UFR II / FAX / ScanGear) After reading the details and disclaimer, click 'I Agree to terms. Download and save the file to your computer. Once the download is complete, double-click the file from its download location to begin the installation. You will also need to download and install the [Windows 32bit & 64bit] Tool Box Ver.4.9.1.1.mf18" file as well for the scanner which is located under the "Software" tab.
If you continue to have difficulties, please contact our support group using the following link:
http://Canon.us/ContactLI