App SFC can be out protected windows you check of good health and the presence of them, to be sure. The most simple way to use it, type, sfc /scannow at the command line. This program can be out corrupted or missing from the zinc Windows you to System Restore. (If the wrong file to eliminate you or damage a system , in Windows XP we have System Restore to the last part of the program to you suggest that the in Start -> All programs -> Accessories -> System tools. This program system is you to history that the Prophet (s) he returns.)