I am local, administrator. So far rebooting didn't help, sfc /scannow, and, when I tried to find an earlier restore point, I got the System Restore error 0x80070005. The latter seems to happen in various scenarios and will tackle that problem later. I have a 64 bit version of Windows 8 that is based on an upgrade of Windows 7. Up until yesterday afternoon, I didn't notice anything wrong with the user account picture in Start8, but I installed a few different things yesterday that might have something to do with it:
