Sound you got a virus that corrupted a certain file in your Windows operating system. Try googling with a descriptive computer keep rebooting or something similar. Basically you need to replace that corrupted file and there are hints in the Internet on how to do this.
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3 things: You got bit by the WPA check (Windows Protection) and it IS telling you your copy is invalid and you need to re-register it (VDDUndo virus does this) - So does pirated SW that eventually shows up on two machines
You changed Hardware or Chip and your 'configuration' is invalid and windows cannot start and tries again and again but you cannot see it b/c it is so fast. Start in SAFE mode (F8 while booting) and select Do not auto restart on error or Enable Debugging) and you can trap that and it will freeze where it fails
Your configuration changed and one or more drivers are invalid, conflicting or just plain not right for the 'discovered' hardware. Start in SAFE mode, run START, Run and type compmngt.msc, open drivers and DEL and YELLOW or RED flagged items you see, then restart and WIN will discover, rearrange and reinstall them again.
May take 5-6 auto reboots, you may hae to do it 2-3x. If it 'hangs' Just power off (Press and hold Power button)
try the computer with an external monitor, if it works correctly then it's the monitor that has broke and you need it replaced. otherwise, if it does the same things on the external monitor... I would check in order: 1)RAM memory 2)Motherboard if the problem is only after windows boot, try changing the video driver, the problem might be caused by overheating video Chip, but that should freeze the system too...try also to remove the dust from all the heatsinks with canned air...
Have you tried safe mode? You can access it by hitting F8 while the computer is booting up (I tend to press it at 1 second intervals, much faster and the computer gets annoyed :P) You'll get a menu that will let you pick safe mode.
If you can get at the desktop in safe mode then i would suggest shutting off all your start up programs (the list can be accessed by going to the start menu, selecting run, typing in "msconfig" and pressing enter). After those are shut off try rebooting back into normal mode and see if that works. If it does, then you know that a program starting up with the computer is causing the problem and just need to be singled out and removed.
Is it as the windows login screen or is it some other screen like for a bios password.
If its a BIOS password, you will most likely have to call the manufacturer and prove its yours and not stolen and have them give you a master password, or use the Original CD to do a recovery and remove it if possible.
Alot depends on the make, model and type of passwords your talking about.
My Toshiba Satellite does a similar thing, It goes gray while I am working on it. The only way to continue to work on it is to complete shut it down manually and reboot. I took it to Toshiba they said nothing was wrong.