1.Thank yu guys for your reply. What is the problem with MS is if a used had to format his HDD and reinstall the XP then he needs to start over again for updates! My Update manager is on! But even before I update the system i was hit by the Trojan. My last submission of Wincore is yet pending no updated signature is available their.
    2.Honestly I hate Norton and paying too! But what is important is my data on the drive. I do know that no AV can be 100% perfect! but I atleast expect that Avast should catch the Virus 50% time when I'm hit! and 2 times i was hit and 2 times it failed! 
    3. Updating windowsXP is a joke! My update manager keeps downloading and patching the system all the time! But again what if you had to format again? If you do then you have to start over again patching the system.  Good thing was I had a good firewall that alerted me!
    4. Most important thing! If the package I install is not protecting my needs and is ready to catch the things I'm not getting hit by what is the use of it? Norton sucks! It has drastically slow down my system! But I'm much secure than Avast!