Hi Mr.chetan,
Thanks for ur reply. I have tried the steps suggested by you but still iam getting the same error and also tried more than 10 times uninstalling and reinstalling 12.1.
I have also found teefer.sys file is missing in windows\system32\drivers folder.
here i have given the teeferinstall log file.
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2011-11-16 13:11:17 sourceFolder: C:\Program Files\Symantec\Symantec Endpoint Protection\12.1.671.4971.105\Bin\TeeferXP
2011-11-16 13:11:17 teefer.inf: C:\Program Files\Symantec\Symantec Endpoint Protection\12.1.671.4971.105\Bin\TeeferXP\teefer.inf
2011-11-16 13:11:17 teeferm.inf: C:\Program Files\Symantec\Symantec Endpoint Protection\12.1.671.4971.105\Bin\TeeferXP\teefer_m.inf
2011-11-16 13:11:23 Acquired write lock for 'Symantec Firewall'
2011-11-16 13:11:24 ERROR: Call to installNetComponent() failed: 0x800f0203
2011-11-16 13:11:24 Teefer install failed, trying once more in 5 seconds
2011-11-16 13:11:29 Found 'oem13.inf'
2011-11-16 13:11:29 Found 'oem8.inf'
2011-11-16 13:11:29 Uninstalling 'oem8.inf'
2011-11-16 13:11:29 Uninstalling 'oem13.inf'
2011-11-16 13:11:29 Acquired write lock for 'Symantec Firewall'
2011-11-16 13:11:29 ERROR: Call to installNetComponent() failed: 0x800f0203
2011-11-16 13:11:29 InstallFirewall failed second attempt: -1
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iam using windows xp service pack 3 with latest windows updates.
Any other way to resolve this issue?