Help! Can'T Update!

Please help me… i can’t update my Avast 4.8 Home Edition…
Til now i still have this file version : 080723-1.

Please help… Thanks!

Welcome jcharex

What operating system are you running and Service Pack?

Are you running a firewall?

Did you have another anti virus application installed previously?

Please, post the last 300-350 lines of avast log: C:\Program Files\Alwil Software\Avast4\DATA\log\Setup.log

my operating system is windows black xp service pack2

previously i use nod32 i unistall it and i use avast again
i am using windows firewall…
im still having trouble updating my av

??? Can you?