Welcome Florence8574 to Geeks to Go.
The error indicates that the monitoring for the hard drive is indicating an imminent failure of the hard drive.
It does not absolutely mean it will fail, but chances are good.
First and foremost is you need to back up your data, movies, pictures, emails, etc.
Next you need to run the hard drive manufacturers diagnostics. The link is in my signature. You need to know the manufacturer (seagate, western digital, maxtor, etc).
If you do not know, we can run a program to get that info.
Is this a laptop or desk top?