No CD-ROM Windows XP system automatically fixes damaged files

1, first we confirm that the Windows XP system installation files on that disk, we assume that the installation file in C, and then use the key combination (Win key +r) Open the Run window, and enter "regedit" and then click the "OK" button to open the Registry Editor, as shown in the following figure:

2, in the Registry Editor window expand Hkey_local_machinesoftwaremicrosoftwindowscurrentversionsetup Primary Key, find Cdinstall on the right and double-click to open its Modified key value window, Change its key value to "0" and then click the "OK" button, as shown in the following figure:

3, and then double-click ServicePack SourcePath and SourcePath to open the edit string, set the numeric data to "C:XP" in the pop-up Edit String window, and then click OK, as shown in the following figure:

Complete the above modification settings, then open the Run window and enter Sfc/scannow press ENTER to perform the XP system automatically repair files, this time will not be required to put the disc. Here's a detailed operation to automatically repair the damaged file without the CD-ROM Windows XP system.