To check file integrity, you run SCANDISK and DEFRAG. There are several programs from vendors that will check your system, but they basically use these utilities in a different user interface to impress you. In scandisk, select the thorough option and if you want, run it after you are finished with your puting for the day/nite, as both of these can take over 2 hours to run. Use the automatically fix errors option, so you won't have to sit there and answer each question as it discovers an error. also run them in that order. Otherwise, defrag may halt on you and request that you run scandisk, slowing down the timeframe for task comletion. This is just the start.