how can i fix my E1 system computer?

i have a e1 system computer and h ave had this computer for 2 years now and havent had any trouble before hand i have 2 computers the same one which now gives me an error it reads on the screen windows could not start because the folling file is missing r corrupt: windows root>\SYSTEM32\HAL.DLL.lease re-install a copy of the above file. and it also said file\i386\system32\bios info.inf could not be loaded the error code is 18 and thats all it comes up with .can anyone please give me advise on what to do i had no set up disk either with this .if it is any help i have two computers the same i dont no much about computers and what to do many thanks bri urgent