When opening “File Explorer” from Start Menu it is possible you could have your Explorer process crash. I myself ran into this issue, so this is how to fix it.
The culprit is Windows 10 Quick Access being too cluttered with recent files (especially big ones).
1: Create a link to your C drive on desktop “C:\” and open explorer from there.
2. RIGHT click “Quick Access” group from the left hand pane and click “Options”. Change “Open File Explorer to” to “This PC” and click the “Clear” button as seen in the image below.