Event ID 4 Source: SRTSP

I am observed below event id is triggering for daily 2 times. but server is running with latest definition files and also noticed that their is few old definition files were existed in the below location. Can anyone please help me out to don't trigger in future.

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Source: SRTSP

Category: 0
Event ID: 4
Event Description: Error loading virus definitions.

Event Log Name: System
Event Log Type: Error
Event Log Date Time: 20140205200355.000000-300

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C:\Documents and Settings\All Users\Application Data\Symantec\Symantec Endpoint Protection\CurrentVersion\Data\Definitions\VirusDefs  - Attached screen shot for your reference.