I suppose you didn't make a password reset disk as suggested, right? I also suppose that you didn't backup your files? If the answer to those questions is "No," then you know what to do in the future. You have been warned...
You could try to pressing F8 during bootup and entering Safe Mode and seeing if that would let you reset the password, but I doubt that would work, unless you're running Windows Vista Business or Ultimate.
Ultimately, you may have to reinstall Windows and all your software. Fret not, though; during the reinstall, Vista creates a folder named windows.old that will have all the data that was on the C:\ partition prior to the reinstall. Assuming your pictures and data are on the C: partition now, you'll be able to copy them from the windows.old folder to the new install. After you finish that, you can delete the windows.old folder, as it no longer has any usefulness.
Hope this helps,
I have a Gateway computer, vista windows and just changed the log on password and then forgot it.
Is ther anyway to change the password, yet I don't know it? If I keep pushing F8 as it is coming on and reboot then will I lose all the pictures and data I have?
Or anyway to go back in time before I changed it and use the old password.