It has been apparent that a recent Windows 7 update had broken some SAMD related drivers. SparkFun has created our own drivers for our SAMD21 and SAMD51 products which you can find here:
Keep in mind that the SAMD device you are installing drivers for has to be in bootloader mode initially for the board to be recognized properly. You will also need to but the SAMD products in bootloader mode whenever you upload code to them.
You can find out how to get a SAMD product into bootloader mode [here .
We hope this helps!](https://learn.sparkfun.com/tutorials/samd21-minidev-breakout-hookup-guide/all#troubleshooting/releases)](Releases · sparkfun/samd_windows7_installer · GitHub)](GitHub - sparkfun/samd_windows7_installer: Windows 7 installer package for SparkFun's SAMD21/SAMD51 based breakout boards)