S.M.A.R.T is an acronym for Self-Monitoring, Analysis and Reporting Technology.
In simple terms, it monitors your hard drive for any reliability issues or errors. If you are getting warnings from S.M.A.R.T it means someting is going wrong with your hard drive. The first thing you should do is back up any important data to an external source (CD/DVD, USB Stick etc). I would then consider running a disk check.
- Press the start button
- Search for: cmd
- Right-click cmd and select 'Run as Administrator'
- In the command prompt that opens type: chkdsk /r c: This is assuming Windows is installed on the C: drive. If not, use whatever letter it is assigned
- You will be told the drive cannot be locked and asked if you want to run at next reboot. Enter 'Y' and reboot the computer
- Upon booting into windows a disk check should start. It can take quite a while but will hopefully repair any errors. If it finds a significant amount of unreadable data, bad clusters, bad sectors etc... you probably need to be looking at replacing the hard drive in the very near future.