Samsung PC doesn't recognize SD card

In some cases a simple reboot will clear the system and restore functionality.

There are several ways to reboot Windows. One way is to right-click Start, select Shut down or sign out, and then select Restart.

If Samsung Update is available on your model, it will be preinstalled and can be found in the Start menu. If it isn't installed, it can be downloaded from the Microsoft Store.

Some models are supported entirely by Windows Update instead (see next step). If you are unable to download Samsung Update or if you download it and it says to use Windows Update, then use that instead.

1. Press the Windows key and the X key, or right click the Start button. Then, click Device Manager.
2. Locate the SD reader. Sometimes problematic devices will have an exclamation point on their icon, but this isn't always the case. Devices are sorted out by type in a tree structure. The SD reader should be located under SD host adapters. The actual name of the device will vary between models.
   
3. Once you have located the device, right click it, and then click Uninstall device.
4. To reload the driver back again, click Action on the menu bar, and then click Scan for hardware changes. You can also reboot the PC to have Windows reload the driver.

When the driver is reloaded, all its settings will be reset to default.