I need some help - I got a message to install the latest security update, but the updater froze when I told it to install. Now I cannot start any new applications or processes (activities like copying files, emptying trash, etc. don't work) The apps which were running before are still working (but once closed, will not re-open) I dare not restart or put the computer to sleep. (possibly software update freezing was a symptom rather than the cause - it is consistent with processes failing to start) I guess this means a system file has been corrupted, but without a working copy/paste and no terminal I don't know what I can do about it. All I have is a browser (firefox) and finder running. Is there any way I can recover the system?