best anti virus software

[manmathan]

i am using avast antivirus 4.8 home edition . i am not having net connection in my home so i cant update avast regularly , i am always getting error msg for updating, it annoys me so tell any antivirus software that easily update virus definitions frm net like avg we can download defintions frm net and we can update . dont tell avg bcoz i have already used for 5 yrs . i need try new antivirus soft ware. i dont know wat`s best antivirus software in market so pls tell me which is best ???????
explain in detail.....

my pc sefications
865 mb(mother board)
1 gb ram
p4 processor 3 ghz.

[rhitwick]

Please S E A R C H b4 u post................

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