|May have more than on issue. Never run it as an admin. Always use a limited account.|
In this case try booting to safe mode. Try to log on as administrator or your user. Then try to create a new admin account. Then go back to regular startup and see if you can access the new account. Then I think I'd simply use that as the admin account and make a new limited user for your daily use.
"The era of big government is over," said Clinton 1996