AntiVirus is not working Properly.
Some time due to un Register Version of Anti Virus, the Anti Virus Software does not work properly.
There can be some other too which are described as under:-
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During Installation, some necessary may be missing.
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2- The Medium of Software from where we are Installing the Anti-Virus Software (CD-DVD etc) may be have some any problem.
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Some Anti-Virus Software's require Updates after installation or during installation it require the Registration Live from the   Anti-virus Software Website and due to not connectivity with internet it may not work properly, in this case please keep up to date your Anti-Virus Software according to the requirements.
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Some time the Computer system have already infection by Viruses and with proper formation the Virus does not allows Anti-Virus Software's to be Install on the Computer, if this happen that please format your infected data first and than try to install your anti-virus software.
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Some time due to an old version of Anti-Virus Software it may not work.Â