You can use the REPAIR command to repair your system. REPAIR PathtoERFiles PathtoNTSourceFiles /NoConfirm /RepairStartup ...

You can use the REPAIR command to repair your system.    REPAIR PathtoERFiles PathtoNTSourceFiles  /NoConfirm /RepairStartup /Registry        PathtoERFiles:  Path to the Emergency Repair Disk Files                      (Setup.log, autoexec.nt, config.nt).  If this parameter                      is not specified, REPAIR prompts the user with 2 choices:                      Use a floppy disk, or use the repair info stored in                      %windir%
epair.        PathtoNTSourceFiles: Path to the Windows Installation CD files.                           This is the CD-ROM drive if not specified.        NoConfirm: Replace all files listed in setup.log without prompting the                 user. By default, the user is prompted to confirm the                 replacement of each file.        Registry: Replace all the registry files in %windir%\system32\config                with the original copy of the registry saved after setup and                located in %windir%
epair.        RepairStartup: Repair the startup environment, boot files, and boot                     sector.
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