You should wipe the drive and try installing again. Most times crashing during install is caused by RAM faults. Try changing RAM, or recofiguring your RAM in the BIOS to make sure it's correct.
It can't find NTLDR becasue uit didn't write the MBR before it crashed, most likely. So just wipe the drive (reformat), and check your RAM config, and try again.
What RAM do you have, BTW?
Cheers
mick
Oh, and Welcome to TechIMO!!