If you get a message when you load Windows XP that says that HAL.DLL is missing or damaged then the replace the file using the following steps.

1. Boot the PC from the XP Installation CD
2. Get to the command prompt
3. Copy the file called ntldr from the i386 folder to the root directory. .e.g c:\
4. Copy the file called ntdetect from the i386 folder to the root directory. .e.g c:\
5. Delete the boot.ini for the root directory. e.g. c:\
6. run the following command bootcfg /rebuild
7. reboot the PC.

If the same error occurs then test the hard drive, it may be damaged.