Image previews and thumbnails look tiled or broken on Windows when you use Lightroom or Camera Raw to adjust your images. This problem occurs with recent drivers from NVIDIA (369.x to 374.x).
Visit the NVIDIA website and update your NVIDIA driver to v375.86.
This issue is listed as fixed in this NVIDIA document: see page number 14.
"[375.86, GeForce GTX 960] Tearing, checkerboard corruption occurs in Adobe Lightroom. "