While Windows is booting, press f8 to come into the boot menu (like you would do to boot into Safe Mode). Choose the option to stop on errors (it's described in http://www.computerrepaircentral.com.au/computerwillnotstart.php, second paragraph, and don't mind the details, because it's unlikely to apply to your particular case).
That should give you time to copy the full message to paper and then later retype it here. If it doesn't work, just repeat the few seconds blue screen enough times to fill in the blanks below. It's rather essential information.
And, alas, no, you can't download Windows XP. You buy it. If you are a registered user Microsoft you can order a replacement copy for less than a new version. If the 'installation disk' contained the drivers, you might need to spend some time to collect those from several places on the web.
It's possible this is a hardware issue. Then it's possible (but not sure, because we don't know how old the machine is) that a new PC would be a better investment. And maybe (but we don't know either at the moment) it's a simple repair without need for the CD and the PC lives happily for 6 years.
Recently my dad's computer has been acting weird. When he tried to turn it on. Nothing would move. I just unplugged it and everything worked fine. It was weird because it had never done that before. So a few days pass. It did it a second and third time. Now we get to today (he was in the middle of sending e-mails, he says things started to slow down and he had to restart the computer that's where it all started) and he gets the normal information boot screen...the windows xp logo. Then a blank screen followed by a few second flash of a blue screen with an error message.
Now whenever you turn it on you go to the safe modes and normal start screen it has a counter that counts down from 30sec.
Now the message doesn't stay on the screen so I couldn't read what it says. I took a video of it to see if I could read it but it came out fuzzy but here is what I think it says...
Stop: _________ _______ _________ Failure).
the registry cannot load the _____ (file):
(some file name)
or ____ log or alternate
It is corrupt, damage, or not writable.
__________ dump of physical memory
Physcial memory dump complete.
Contact your system administrator or techincal support group for further _________.
So what is wrong? Why is it doing this? Can it be fixed? Also we lost our Windows XP boot disk and installation disk. Is there a way to download it from the microsoft website?