The Mac runs quite a few background tasks from time to time, to take care of routine maintenance. These maintenance tasks include purging older cache files and temporary files, rebuilding databases, and flushing old log files. One thing the background maintenance tasks don't work with is user accounts.
Screen shot courtesy of Coyote Moon, Inc.
Normally, there shouldn't be a lot to do to keep a user's account operating without issues. But over time, little things can crop up; given enough time, little things can turn into bigger things.
One of the most common problems is corrupt file permissions. This problem rears its ugly head when files that a user should have control over suddenly stop allowing the user to access, copy, or move them.
The other problem many users come across is bad memory. No, not in their Macs; in their heads. Forgetting a user account password is a very common problem. Luckily, you don't need to create a whole new user account; instead, you can use an administrator account to reset the password.
The guide below covers file permission issues and forgotten passwords.
Of course, there's always the possibility that you've forgotten your administrator password, too... Don't worry; we've got you covered.