Windows XP Pro won't open with password,i.d.

[smallclaimshammer]

I have a Windows Xp Pro  operating  system, it will not accept my sign on id, there is no running of the floppy drive  or the dvd drive.  The computer  was running on its on, late one night, it would not  respond to my keystrokes to close.  I feared I WAS BEING HACKED...SO I SHUT IT DOWN .  Turning off the main switch.  It will not restart.  It  prompts me for the password/ I.D.  but  responds it is invalid.    I have some digital photos of grandkids , I want to retreive .  How do I get  this to open?   Please any suggestions will be appreciated.

[guestolo]

Are you sure you don't have the Cap locks button on, or off, whatever applies

Are you the only user on the machine?
Any other account that has admin privileges you can boot to?

Can you boot to the hidden Administrator account?
 At the log-in screen, press Ctrl/Alt/Del twice quickly
Type "Administrator" and leave password blank if you didn't set one, if you set the Admin pw. type it in