Windows will not install

HP Omnibook Xe4100 with XP HE. will not install any version of Windows. one day it just quit working. She did not recently install any programs, but when she'd start it up she would receive a Stop error. I ran different memory checkers and none reported problems. tried using the HP Recovery cds, but when it got to about 15%, it said that the Image File was corrupt and the computer would shut down. I tried repartitioning the hard drive and formatting it with both FAT and NTFS. I have also tried running a serious hard drive utility. No errors were found. erased the master boot record. I tried installing Windows 98. but Explorer kept crashing because of kernel32.dll. I tried then upgrading to Win2000. it got to the screen where it said 'Starting Windows', but then it said ntoskrnl.exe was missing or corrupt. So I restored that file. Then it did the same thing and said some other file was missing or corrupt. booted from 2000 or XP cd - was copying files - it would stop and say that file "x" could not be copied. it would say that the file is either invalid or corrupt...The Cd may be damaged. I used two different copies of XP, one was brand-new. certain features of the BIOS are not available. cannot disable drivers. STOP errors - IRQL_NOT_LESS_OR_EQUAL and ntfs.sys. The only thing I have not done is replace the cd-rom drive. I don't think this is the problem.