I am running Parallels 8 on a MacbookPro Retina. I Updated Windows 7 pro to Windows 8 pro, and after everything went through and was working. Upon re-booting, the keyboard has stopped working at the login screen. I have tried clicking on "ease of access" and the onscreen keyboard and the message "Could not start on screen keyboard" pops up ever so quickly then goes away. I found this thread: https://discussions.apple.com/thread/4237866?start=30&tstart=0 With the same issue, but it does not have a solution unless you are running bootcamp. (Logging into the command prompt and changing the keyagent file doesn't do anything.) Has anyone else had this happen or know a fix? Thanks.