What kind of software or driver issues can cause 'Access Denied' errors with shared printers?

Incorrect or outdated printer drivers are a common cause. Also, some security software or antivirus programs can interfere with printer access. Try updating your printer drivers to the latest version from the manufacturer's website. Temporarily disabling antivirus software can help determine if it's the culprit. Also, check for any software conflicts with other applications that might be interacting with the printer.