PC Hardrive error - keeps lagging?

A computer with a failing hard drive may begin to act strangely all of a sudden. Many programs may crash at once, or the computer may experience a serious error and then refuse to boot up again. Such behavior can be caused by other problems, such as system registry failure, but may also be caused by a hard drive that has failed or is about to fail.. Registry files are the files that give your computer the instructions for what to do next. If these registry files get corrupt or misplaced, your computer fails to understand what to do. In these instances, your computer loses control, eventually leading to a crash. For getting rid of such problems always clean your system from unwanted corrupt files, you can use reginout type of software to auto repair and clean system registry.