Ever since I installed stereo drivers about a month ago, some of my games have gotten erratic and some (specifically Postal 2) permanently displays a "Can't render dll" message in the upper corner. I'm assuming this is related to the stereo driver but I'm not sure how to remove it. Any suggestions?

Thanks!

Add/remove programs doesn't work? Look for it in the windows control panel. Should be listed as nvidia stereodriver or similar.

No, all I have in Add/Remove Programs is Nvidia Drivers; no mention of anything stereo in the list. I'm wondering if they got wiped when I installed the latest driver? I can't find the 3D control panel, even after I tweak the registry. So then why are me games suddenly having issues...

Ok. You can always use drivercleaner to get rid of the entire nvidiainstall, reboot and then install fresh drivers.

Okay, I'm hanging my head in embarrassed shame. Turns out is WASN'T the Nvidia drivers (which I had uninstalled) it was the IZ3D drivers I'd forgotten I installed. I uninstalled them and everything's hunky dory again! Thanks for the assist!

Ok.
You don't have to uninstall the iz3d driver if you use it occasionally. Simply deactivate it in the control center. If it's activated by hotkey it means that it still hooks the game and renders stereo. It's just that separation is set to mono value. Deactivating disables the "hook".
Another way without uninstall: You can add a noncompatible application into the iz3d exception list. The driver will not hook the calls from any applications in the exceptionlist.

Cheers