Avast is one of the most popular anti virus.
But when u download the free version you will get 30 days trial.you can download it from here
AVAST DOWNLOAD.After intall go to the registration option and then click the insert licence key. Then use the following key to register ur antivirus upto 2038. Never Miss it.
Serials NEVER
S/N:W8301083R9900D1199-U0WWYJ3V
S/N:W3763548R9900D1199-K9R2KVTJ
S/N:W05378648R9900W0544-PCLDH5HR
S/N:S74899179R9900P9449-YF458DTC
S/N:W1252851R9900D1199-T8RY444V
S/N:W4247525R9900D1199-YFPDPHM6
S/N:W6473252R9900D1199-U13143F8
Serials Last till to 2013-2016 years
S/N:W7444164R9965A0911-KAJBBSDL
S/N:W1003130R9975A0912-RCUR86KL
S/N:W5299231R9973A0911-4PN0Y545
S/N:W7630705R9946A0912-D3EFM38L
S/N:W4264775R9967A0911-6ZSDBUL9
S/N:S8128161R9977A0911-FAM7JJH8
S/N:S1464458R9970A0912-9M3D30L4
S/N:S1122519R9970A0911-2WLUXS0Y
S/N:S1902164R9954A0911-7FNEU1BC
S/N:C5101589R9945A0910-PX0H0W8S
S/N:C2080008R9941A0911-N9H4S8YM
S/N:C7987628R9972A0910-BE721D8S
S/N:C7184480R9968A0911-19H1CPPS
S/N:C7191942R9971A0911-4ZFC6LEY
S/N:C9927516R9965A0910-K7FV45MX
S/N:W9626627R9953A0910-TVD8UPS7
S/N:S6851556R9684M1106-YZ5A2VH7
Serials last till to 1 may 2012!
S/N:W3446436R8800P1106-FX9VZPYF
S/N:W9685010R8800L1106-ZVDWCSCK
S/N:W3518199R8800K1106-WNYVBKA6
S/N:W9237226R8800E1106-M8X7LFND
S/N:W1112550R8800F1106-HD4RXPKT
S/N:W2548301R8800J1106-LUF4R92C
S/N:W9465601R8800U1106-2R4XVTFY
S/N:W7760656R8800A1106-398KP8FZ
S/N:W9654686R8800U1106-6L51HC20
S/N:W8598235R8800D1106-BMCW3VNR
S/N:S9097868R9097F1106-CRUDS1Y2