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Message: [QUOTE="kmmp, post: 231894, member: 28252"] Hi everyone, I’m facing a persistent driver issue with my [B]OKI C650 printer[/B] on both [B]Windows 10 and Windows 11[/B]. [LIST] [*]When I manually install the official [B]OKI C650 PS (PostScript)[/B] driver (from the manufacturer, with INF/CAT/VER files), Windows [B]keeps overriding it[/B] after reboot and forces the generic [B]Microsoft printqueue.inf driver[/B] dated 2006. [*]Even when using pnputil to delete older entries, or forcing installation via "Add Printer" > "Have Disk", Windows says [B]"best driver already installed"[/B] and won’t let me keep the OKI PS driver. [*]I tried both [B]USB and network[/B] connections – same result. [*]However, the [B]PCL6 driver works perfectly[/B]: it stays in place, offers a much richer print panel (toner options, color control, etc.), and doesn’t get overridden. [/LIST] [HR][/HR] [HEADING=2] Questions[/HEADING] [LIST=1] [*]Why is [B]Windows overriding the PostScript driver[/B] even though it’s signed and valid? [*]Is there a reliable method to [B]permanently enforce[/B] the use of the OKI PS driver? [*]Are there [B]any clear advantages[/B] of using PS over PCL6 for this printer (in real-world usage with PDFs, high-quality graphics, etc.), or is PCL6 actually the better/recommended choice? [/LIST] Thanks in advance for any help or insights! [/QUOTE]