You may have a bad dump. It's worth reripping and and confirming your dump is good.
Have you tried updating your nvidia drivers? If you're on Windows 10 by default Windows likes to mess with your drivers and update them without telling you. Update your drivers from nvidia.com/drivers, after a reboot, go to the nvidia control panel and make a program profile for Dolphin.exe, set the preferred graphics processor to nvidia.
If that doesn't work, maybe your Dolphin user folder is corrupt. You could try deleting it (Backup your GC and Wii folder inside your Dolphin Emulator folder in Documents before deleting this to keep your saves)
Have you tried updating your nvidia drivers? If you're on Windows 10 by default Windows likes to mess with your drivers and update them without telling you. Update your drivers from nvidia.com/drivers, after a reboot, go to the nvidia control panel and make a program profile for Dolphin.exe, set the preferred graphics processor to nvidia.
If that doesn't work, maybe your Dolphin user folder is corrupt. You could try deleting it (Backup your GC and Wii folder inside your Dolphin Emulator folder in Documents before deleting this to keep your saves)