Bought Avast Cleanup & ran the tune up. Then had to go out of town for several days. On return, it looks like my normal login account was replaced by a new account of the same name -- but without my real account's desktop, defaults, etc.
My Admin account looks OK.
Looking at Users>user, that looks like it contains my account info. How do I get it to let me log in?
BTW: the Capcha image is virtually impossible to read. 5 tries so far :-(