I got this error message (among several others) this morning when I tried to log on. After reading the different events in the Event Log (I attached 1 of each event), I tried to troubleshoot the problems (here's the list): 1502: Windows cannot load locally stored profile 1508: Windows was unable to load the registry 'C:\Users\Deana J. Shaffer\ntuser.dat' and 'C:\Users\Deana J. Shaffer\AppData\Local\Microsoft\Windows\\UsrClass.dat' (quotes used to ID files) 1511: Windows couldn't find local profile-logging on with temporary profile 1542: Windows cannot load classes registry file but didn't find any information on how to fix it. After a few minutes of brainstorming (and cussing out my computer! ha ha), I did the ONLY thing I thought would help: run System Restore, which solved the problem. My questions are: WHY did this happen (registry/files were corrupted) and HOW do I keep this from happening again? I'm running Windows 8, 64-bit operating system, x64 based processor.