Here is my experience. After upgrading to Windows 10, my PIN login no longer worked. So I tried to access the NGC folder and could not do so even with Administrator privileges but I used a free program to finally access the folder. I deleted everything in the NGC folder and the s*?t really hit the fan. A good number of features totally stopped working and other than reinstalling windows, the only other solution was to uninstall windows 10 and then reinstall it. That fixed everything and now my PIN Login is working. Good luck ppl... :wink: