\system32\hal.dll file

I am haveing a problem with a Missing or Corrupt \system32\hal.dll file on a dell machine.

I start up the computer enter the bios change the boot sequence to boot from CD-ROM then restart so it boots from the OS disc.

on the first screen i get three options

1. install the OS

 2. repair the OS

 3. exit

selecting the repair option gets me no ware as it asks what windows (something or other) i would like to log on too??

so i selected the install option hopeing there was an reapir option on the install screen where the three partitions are displayd (one of witch is a hidden one) but there is not.......only three more options

1. install OS on the selected partition

 2.delete partition

 3. exit.

is there anyone out there that no's if there is a repair option after you select the install option??? and if so what partition do i do this on??? or can i go a head an delete the two partitions ( but leaveing the hidden one) and make a new partition and then reinstall XP????

cheers verey much for any help the now

and please dont just post a link for some tech site and think this will help....