Source path
When you install windows, the setup records the location where you installed from. Then whenever your system needs a file from the setup, the system will look in that directory. If you installed from the CD, the system will ask you to insert the CD to get the file. This means whenever you update your system and it needs a file, you have to insert the CD. If you want the system to pull from another location, you will need to edit the registry. Below is the steps on editing the registry.
Choose the operating system