Hey!,
Try giving this ago...
1. Disable ShadowPlay in Geforce Experience.
2. Open Regedit.
3. Find folder HKEY_CURRENT_USER\SOFTWARE\NVIDIA Corporation\Global\ShadowPlay\NVSPCAPS\
4. Delete binary keys DefaultPathW and TempFilePath
5. Active ShadowPlay in Geforce Experience and check the settings. Folders should be back to default.
The above should work, however, if it doesn't then it may be best to try and re-install all relating software's. As it had only been a recent issue. Hopefully, this helps.