|Try live linux cd maybe. Try another ms install cd/dvd and see how far it gets.|
Might try memtest.
Might have bad cd reader or any part of, might be ram issue, might really any part.
Set bios settings to default or failsafe and try again.
"Best Practices", Event viewer, host file, perfmon, antivirus, anti-spyware, Live CD's, backups, are in my top 10