missing HAL.DLL

HI, i have a problem. i tried to re-install new windows and it showed me that some of the files are not being able to copy, then it showed me that NTLDR - is missing, i copy it from CD, and now it showing "windows could not start because the following fule is missing or corrupt:
<Windows root>\system32\hal.dll.
Please re-install a copy of the above file.

the problem is that it doesn't let me do anything , as soon as i press any button its just restarting computer and it goes to the same msg., i looked in the boot if i have to put
CD-ROM so it would start booting from it , but it's already there on the first place.... what should i do ?

 

what happened is , i tried to re-install windows, i had copy CD of original windows that i use many times and didn't have any problems before. i tried to format the hard drive and install fresh windows, in the middle of installing process of installing it showed that cant copy bunch of system files. i looked at CD and it was scratched. i brought new different CD student edition. before i used it it showed me that it missing NTLDR file, i coped that file from CD with student edition. now it showing that HAL.DLL i missing or corrupt and i need to re-install it, but it not letting me do that caz as soon as i tried to type line or any button it's just restarting and goes to the same position with same msg. what should i do now?