Sometimes the OS needs additional files after the OS is installed. It normally gets them off the installation CD. This change allows you to get the files from somewhere else like the hard disk.

1. copy the "I386" file structure from the installation CD to your hard disk. That means every sub-folder is copied, every file is copied, and every file is in the correct sub-folder.
2. navigate the registry with REGEDT32
1. HKLM
2. Software
3. Microsoft
4. Windows
5. Current version
6. Setup
3. modify the following registry entries
• "installation sources" = {the new installation directory}
• "SourcePath" = {the parent directory}

For example:
if you put installation files in "C:\I386"
 installation sources would be "C:\I386"
 SourcePath would be "C:\"

NOTE:
You cannot use Regedit.exe. If you try to view the data values with Regedit.exe they will display as binary data type. This is because Regedit.exe does not support the REG_MULTI_SZ data type. You must use Regedt32.exe.