When installing Windows XP Service Pack 3 (SP3) on Intel iMAC using Bootcamp to run Windows XP you may get the below error
"There is not enough disk space on C:\WINDOWS\$NtServicePackUninstall$ to install Service Pack 3 Setup requires an additional 4 megabytes of free space or if you also want to archive the files for uninstallation,Setup requires 4 additional megabytes of free space. Free additional space on your hard disk and then try again."
This happens because MAC uses EFI file format which Windows XP does not support. To workaround this problem, add a registry key as follows:
1. Click Start - Run - Type “regedit” and press enter.