Did you try what Crashman posted, to see if Windows would load? Have you recently added any RAM to the machine, or any other hardware at all? From everything you've posted it seems like you've got somekind of hardware problem, maybe your RAMs gone bad, if you've got a operational machine you can download Memtest from<A HREF="http://www.bootdisk.com" target="_new">http://www.bootdisk.com</A> in the Utilities section, and run a test on your RAM.
<b><font color=purple>Details, Details, Its all in the Details, If you need help, Don't leave out the Details.</font color=purple></b>