if you are running windows XP .. first, do a disc clean up and also delete cookies. you should then go to your start button, click on " my computer" then right click on "c" drive then click on "properties" then click on the "tools" tab, then to the error checking section, click on the "check now " button, there will be a box appear with 2 options, " automatically fix file system errors" and " scan for and attempt recovery of bad sectors" , select them both!! it may say "it needs exclusive access would you like to scan the next time the computer is restarted?" then click yes and restart your computer.this may take some time to run but it will do it itself and you dont need to be online. its probably just an error on the disc. ....hope this helps