Anytime that you have a shutoff from such as power loss...the chances for damage to key files is there.
My premise is that any such loss of power...should always be followed by the user running the chkdsk /r command from the XP Recovery Console. Chkdsk /r can overcome certain types of file damage that may occur.
The XP Recovery Console is available for download, so it's not a big deal if you don't have an XP CD.
How to Create a Bootable XP Recovery Console CD - http://www.bleepingcomputer.com/forums/t/276527/how-to-create-a-bootable-xp-recovery-console-cd/
How to use CHKDSK in the XP Recovery Console - http://pirules3.14.googlepages.com/recovery_console_chkdsk
Looking at the error message you received, it appears that you are out of disk space. If that's true, some files need to be moved from your system partition before you can expect the system to function properly.STOP Error 0x00000073
I would try running the chkdsk /r command from the Recovery Console first...one of the checks done involves disk space and it may give you the opportunity to boot successfully.
If that fails...then I would remove the hard drive, attach it to a second system...and move some data files (video, graphics, etc.) from the system partition.