Please try to following:

Check your disk:

  1. Open "My Computer", right click on your disk, "Properties", "Tools", "Check Now";
  2. Mark both check-boxes: "Automatically fix file system errors" and "Scan for and attempt recovery of bad sectors";
  3. In the opened window press the button "Yes";
  4. Reboot computer.

After reloading:

  1. In command line ("Start", "Run", "cmd") type: "chkdsk C: /F" /R;
  2. Select "Yes".

After that please try the operation again.