Any thoughts on this, XP userI have receive several system lockups that when restarted and looked at

[System]

I have receive several system lockups that when restarted and looked at in the event viewer indicate there was an error in updating signatures event #2004. This is the actual error message:Microsoft Antimalware has encountered an error trying to load signatures and will attempt reverting back to a known-good set of signatures. Signatures Attempted: Current Error Code: 0x80070003 Error description: The system cannot find the path specified. Signature version: 0.0.0.00.0.0.0 Engine version: 0.0.0.0

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