My computer is still infected with virus. i have norton anti virus also?

Q: When i installed windows xp to my laptop after formatting hard drives. i installed symantec antivirus 10.1.5.5000 but i forget to update it and i put pen drive to my laptop and pen drive was infected with virus.i live update my antivirus. Now my anti virus is not detecting any virus and my laptop is slow also. when i run scan it found no virus. i dont have any other anti virus or anti spyware installed on laptop. What should i do ? uninstall symentac antivirus and install any other one? or should i format windows again? formatting takes a big time ...can virus can be removed me without formatting laptop drives?????????? reply me with good answes my auto protection is disabled automatically also with in 10 minutes on starting laptop

A: Uninstall Norton with norton removal tool : http://service1.symantec.com/Support/tsgeninfo.nsf/docid/2005033108162039 install Avira AntiVir : http://www.free-av.com/ And spybot Search & Destroy : http://www.safer-networking.org/en/spybotsd/index.html

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