The best way to start scandisk is to double click on “My Computer”, then right click on the “C:” drive and select properties from the list that appears....
From the next menu select “Tools” and then “Check Now”
The scandisk screen will now appear, select all the boxes and click on “Start”. Scandisk will begin. Be warned this may take several hours, so don’t run it, if you are going to need the computer in a rush. Some people tend to run it over night or before they go to work.