GoPro and Scandisk Ultra 64 micro sd

I recorded loads of amazing holiday footage on a SanDisk Ultra 64 using GoPro Hero3 as recommended. When I put the sd into my pc (Win 8) it keeps asking me to reformat. Now when I put my sd back in the GoPro it comes up ‘SD Error’ Does anyone know how I can retrieve my data off the sd card?

I was curious, so I went to the GoPro website. They say both micro SDHC and micro SDXC cards are supported. Amazingly, they suggest that when you see SD error on the camera, that you backup your video, then format the card, deleting all the video on it. 

Did you insert the card in the camera when the camera was off? If not, try that. 

gopro.com/support.

https://gopro.com/support/articles/no-sd-or-sd-err-on-cameras-lcd

Hi JK98 - thanks for getting back to me. I tried that - unfortunately it didn’t work.