problem with VPS update

Hello, I’got trouble with update virus definitions after instalation Avast.
It is version 4.8.1356 Home Edition and I’m using Windows XP Professional with Polish interface.
When I try the first time update VPS, I haven’t install any firewall, now I have a Firewall… It is ZoneAlarm 8 Free Editions
Avast is installed after deinstation ESET Smart Security, when this product finish functionality…
Now I don’t have any other anti-virus installed…
I try reinstall Avast, but I have still the same problem
Yes, but after I reinstalled it, it can’t update, I have also tryed to update manually, but even that wouldn’t work…

Ther is some logs data which I get when try update VPS.
12.11.2009 17:11:05 internet: Used server: http://74.55.53.50/iavs4x
12.11.2009 17:11:07 general: Server definition(s) loaded for ‘main’: 313 (maintenance:0)
12.11.2009 17:11:07 general: SelectCurrent: selected server ‘Download955 AVAST Server’ from ‘main’
12.11.2009 17:11:07 internet: SYNCER: Type: use IE settings
12.11.2009 17:11:07 internet: SYNCER: Auth: another authentication, use WinInet
12.11.2009 17:11:08 general: InvalidateCurrent: invalidated server ‘Download955 AVAST Server’ from ‘main’
12.11.2009 17:11:08 general: SelectCurrent: selected server ‘Download735 AVAST Server’ from ‘main’
12.11.2009 17:11:08 internet: SYNCER: Type: use IE settings
12.11.2009 17:11:08 internet: SYNCER: Auth: another authentication, use WinInet
12.11.2009 17:11:08 internet: while trying to get file ‘prod-av_pro.vpu’, error 0x20000006 has occured, try 1
12.11.2009 17:11:08 file: Server returned 404 on file prod-av_pro.vpu
12.11.2009 17:11:08 general: InvalidateCurrent: invalidated server ‘Download735 AVAST Server’ from ‘main’
12.11.2009 17:11:08 general: SelectCurrent: selected server ‘Download793 AVAST Server’ from ‘main’
12.11.2009 17:11:08 internet: SYNCER: Type: use IE settings
12.11.2009 17:11:08 internet: SYNCER: Auth: another authentication, use WinInet
12.11.2009 17:11:08 internet: while trying to get file ‘prod-av_pro.vpu’, error 0x20000006 has occured, try 2
12.11.2009 17:11:08 file: Server returned 404 on file prod-av_pro.vpu
12.11.2009 17:11:09 general: InvalidateCurrent: invalidated server ‘Download793 AVAST Server’ from ‘main’
12.11.2009 17:11:09 general: SelectCurrent: selected server ‘Download730 AVAST Server’ from ‘main’
12.11.2009 17:11:09 internet: SYNCER: Type: use IE settings
12.11.2009 17:11:09 internet: SYNCER: Auth: another authentication, use WinInet
12.11.2009 17:11:09 internet: while trying to get file ‘prod-av_pro.vpu’, error 0x20000006 has occured, try 3
12.11.2009 17:11:09 file: Server returned 404 on file prod-av_pro.vpu
12.11.2009 17:11:09 general: InvalidateCurrent: invalidated server ‘Download730 AVAST Server’ from ‘main’
12.11.2009 17:11:09 general: SelectCurrent: selected server ‘Download657 AVAST Server’ from ‘main’
12.11.2009 17:11:09 internet: SYNCER: Type: use IE settings
12.11.2009 17:11:09 internet: SYNCER: Auth: another authentication, use WinInet
12.11.2009 17:11:09 internet: while trying to get file ‘prod-av_pro.vpu’, error 0x20000006 has occured, try 4
12.11.2009 17:11:09 file: Server returned 404 on file prod-av_pro.vpu
12.11.2009 17:11:09 file: GetNewerStampedFile:GetFileWithRetry failed: C:\DOCUME~1\KRZYSZ~1\USTAWI~1\Temp_av_proI.tm~a00180\onefile, prod-av_pro.vpu, error: 0x20000006
12.11.2009 17:11:09 package: Tried to download prod-av_pro.vpu but failed with error 0x20000006
12.11.2009 17:11:09 package: LoadAllDefs failed 0x20000006
12.11.2009 17:11:10 general: Err:Other HTTP error (404), while trying 208.43.71.130:80//iavs4x/prod-av_pro.vpu

Please help me

Try repair of avast through Add & Remove programs and let your firewall connect to avast when the computer is online to the web?