The corrupted or missing HAL.DLL error message encountered when starting up a Windows operating system is misleading, as the problem comes from inconsistencies in the BOOT.INI file as opposed to the named DLL file. The issue can be solved by editing the boot.ini file manually with the correct partition number. Another way to solve the issue is by rebuilding the Boot.ini file. The computer has to be started with the boot disk to access the boot.ini file. The boot disk for Windows can be downloaded from the internet for free. After Boot.ini has been fixed, the corrupted or missing HAL.DLL error should be fixed.