My Satellite M45-S169 Keeps restarting

Question

I just got my computer [Satellite M45-S169] back from a friend who had it for 2 weeks and when i turn my computer on and it starts to load but then gos to the "we apologize for the incovenience, but Windows did not start properly" page.  So i hit F8 and go to advanced settings and disable the restart on system failure. It starts to load but stops half-way and then goes to so weird blue screen that says
STOP:  c0000218  {Registry File Failure}
the registry cannot load the hive (file):
\SystemRoot\System32\Config\SOFTWARE
or its log alternate.
It is corrupt, absent, or not writable.
Beginning dump of physical memory
physical memory dump complete.
Contact your system administrator or technical support group for further assistance.
I NEED HELP!!!

Answer 1

Satellite M45-S169 
the registry cannot load the hive (file): \SystemRoot\System32\Config\SOFTWARE
Bad news. The Software hive is a vital branch of the registry. Without it, Windows will not run.
Unless you had provided in advance to restore the registry, you would need to be especially proficient technically to recover from this.
   How to recover from a corrupted registry that prevents Windows XP from starting
You will probably need to restore the hard drive to an earlier state.
Do you need to access important files first?
-Jerry