I can not afford to delete SymantecAntiVirus how to do?

Users questions:I can not afford to delete SymantecAntiVirus how to do? I'm using xp. Because at that time I did not installed by others unloaded before, there is no clean uninstall, add remove items which are also removed, but when prompted to remove the password. However, I do not know what anti-virus software, is now out ofNow the problem is that when you click the right mouse button will pop-up windows are configured SymantecAntiVirus. Expert help me to resolve about it, Thank you very much.
Experts answer: you might subtypes in the Symantec worm viruses, which mainly manifested: the emergenceSimilar to the anti-virus software, REGEDIT entry. There is no good solution, but to look at re-formatting the hard drive to install WINDOWS.
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