error code c000021a- system failling to boot

System will not boot up even into any of the safe modes. i want to avoid having to reinstall windows xp onto the system. system comes up with windows xp then blue screens and reboots. I have tried running a check disk with no change superantispyware with no change.
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TechdivisionAuthor Commented:
I restored the system using the sony Vaio recovery partition. System stable and working correctly now.

you could try to do a repair installation of windows .
Instructions here :
Also be sure to check stuff like your memory, and system temperature.
Please have a look at this and also an earlier post in EE on the same 
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