imm using windows xp and it has a problem regarding its booting process
an error comes out right after the windows xp logo starts up

STOP:C0000218 {Registry File Failure}
The registry cannot load the hive (file):
\SystemRoot\System 32\Config\SOFTWARE
or its log or alternate
It is corrupt, absent, or not writable

Beginning dump of physical memory
physical memory dump complete.
Contact your system administrator a technical support for further assistance.

POST PLS.
I HAVE MANY IMPORTANT FILES .....