Can you check the contents of this log file?
<avast>\DATA\log\Error.log
There is no Error.log.
FWIW, here's today's section of setup.log:
12.10.2006 13:56:12.000 1160675772 general Started: 12.10.2006, 13:56:12
12.10.2006 13:56:12.000 1160675772 general Running setup_av_pro-37c (892)
12.10.2006 13:56:12.000 1160675772 system Operating system: WindowsXP ver 5.1, build 2600, sp 2.0 [Service Pack 2]
12.10.2006 13:56:12.000 1160675772 system Computer WinName: ORION
12.10.2006 13:56:12.000 1160675772 system Windows Net User: SYSTEM
12.10.2006 13:56:12.000 1160675772 general Cmdline: /downloadpkgs /noreboot /updatevps /verysilent
12.10.2006 13:56:12.000 1160675772 general DldSrc set to inet
12.10.2006 13:56:12.000 1160675772 general Operation set to INST_OP_UPDATE_GET_PACKAGES
12.10.2006 13:56:12.000 1160675772 general Old version: 37c (892)
12.10.2006 13:56:12.000 1160675772 general SGW32P::CheckIfInstalled set m_bAlreadyInstalled to 1
12.10.2006 13:56:12.000 1160675772 system Computer DnsName: Orion
12.10.2006 13:56:12.000 1160675772 system Computer Ip Addr: 192.168.2.106
12.10.2006 13:56:12.000 1160675772 internet SYNCER: Type: use IE settings
12.10.2006 13:56:12.000 1160675772 internet SYNCER: Auth: another authentication, use WinInet
12.10.2006 13:56:12.000 1160675772 package Part prg_av_pro-37c is installed
12.10.2006 13:56:12.000 1160675772 package Part vps-64102 is installed
12.10.2006 13:56:12.000 1160675772 package Part news-4b is installed
12.10.2006 13:56:12.000 1160675772 package Part setup_av_pro-37c is installed
12.10.2006 13:56:12.000 1160675772 general Old version: 37c (892)
12.10.2006 13:56:14.000 1160675774 file SetExistingFilesBitmap: 904->141->141
12.10.2006 13:56:14.000 1160675774 general GUID: d1a52436-062b-4fc2-8577-fdd9a75d09bc
12.10.2006 13:56:14.000 1160675774 general Server definition(s) loaded for 'main': 80 (maintenance:0)
12.10.2006 13:56:14.000 1160675774 general SelectCurrent: selected server 'Download34 AVAST server' from 'main'
12.10.2006 13:56:14.000 1160675774 package GetPackages - set proxy for inet
12.10.2006 13:56:14.000 1160675774 internet SYNCER: Type: use IE settings
12.10.2006 13:56:14.000 1160675774 internet SYNCER: Auth: another authentication, use WinInet
12.10.2006 13:56:15.000 1160675775 general Used server:
http://download34.avast.com/iavs4x12.10.2006 13:56:15.000 1160675775 general Server definition(s) loaded for 'main': 80 (maintenance:0)
12.10.2006 13:56:15.000 1160675775 general SelectCurrent: selected server 'Download75 AVAST server' from 'main'
12.10.2006 13:56:15.000 1160675775 package GetPackages - set proxy for inet
12.10.2006 13:56:15.000 1160675775 internet SYNCER: Type: use IE settings
12.10.2006 13:56:15.000 1160675775 internet SYNCER: Auth: another authentication, use WinInet
12.10.2006 13:56:16.000 1160675776 general Used server:
http://download75.avast.com/iavs4x12.10.2006 13:56:16.000 1160675776 general Used server:
http://download75.avast.com/iavs4x12.10.2006 13:56:16.000 1160675776 general Part of license key: W33624673H3200A1106
12.10.2006 13:56:16.000 1160675776 package Load C:\Program Files\Alwil Software\Avast4\Setup\prod-av_pro.vpu
12.10.2006 13:56:16.000 1160675776 package LatestPartInfo: news = news-4b
12.10.2006 13:56:16.000 1160675776 package LatestPartInfo: program = prg_av_pro-37c
12.10.2006 13:56:16.000 1160675776 package LatestPartInfo: setup = setup_av_pro-37c
12.10.2006 13:56:16.000 1160675776 package LatestPartInfo: vps = vps-64103
12.10.2006 13:56:16.000 1160675776 general Used server:
http://download75.avast.com/iavs4x12.10.2006 13:56:16.000 1160675776 package Part vps-64103 was set to be installed
12.10.2006 13:56:16.000 1160675776 package Removed obsolete file part-vps-64102.vpu
12.10.2006 13:56:16.000 1160675776 package FilterOutExistingFiles: 141 & 141 = 0
12.10.2006 13:56:16.000 1160675776 package FilterOutExistingFiles: 141 & 141 = 0
12.10.2006 13:56:24.000 1160675784 package IsFullOkay: vpsm-64103.vpu - not okay
12.10.2006 13:56:24.000 1160675784 package IsFullOkay: vpsm-64103.vpu - not okay
12.10.2006 13:56:24.000 1160675784 package IsFullOkay: vpsm-64103.vpu - not okay
12.10.2006 13:56:24.000 1160675784 package IsFullOkay: vpsm-64103.vpu - not okay
12.10.2006 13:56:24.000 1160675784 general Used server:
http://download75.avast.com/iavs4x12.10.2006 13:56:24.000 1160675784 package DldPackage: C:\Program Files\Alwil Software\Avast4\Setup\vpsm-64103.vpu, returned 0x00000000
12.10.2006 13:56:24.000 1160675784 package Removed obsolete file vpsm-64102.vpu
12.10.2006 13:56:27.000 1160675787 package vps: needs to be updated [064103]
12.10.2006 13:56:28.000 1160675788 package FilterOutExistingFiles: 141 & 141 = 0
12.10.2006 13:56:28.000 1160675788 package Transferred files: 5
12.10.2006 13:56:28.000 1160675788 package Transferred bytes: 10219
12.10.2006 13:56:28.000 1160675788 package Transfer time: 1376 ms
12.10.2006 13:56:28.000 1160675788 internet Sending stats '
http://download75.avast.com/cgi-bin/iavs4stats.cgi': 00000000 204
12.10.2006 13:56:28.000 1160675788 file NeedReboot=false
12.10.2006 13:56:28.000 1160675788 general Return code: 0x20000000 [Something done]
12.10.2006 13:56:28.000 1160675788 general Stopped: 12.10.2006, 13:56:28
12.10.2006 13:56:31.000 1160675791 general Started: 12.10.2006, 13:56:31
12.10.2006 13:56:31.000 1160675791 general Running setup_av_pro-37c (892)
12.10.2006 13:56:31.000 1160675791 system Operating system: WindowsXP ver 5.1, build 2600, sp 2.0 [Service Pack 2]
12.10.2006 13:56:31.000 1160675791 system Computer WinName: ORION
12.10.2006 13:56:31.000 1160675791 system Windows Net User: SYSTEM
12.10.2006 13:56:31.000 1160675791 general Cmdline: /refresh /noreboot /updatevps /verysilent
12.10.2006 13:56:31.000 1160675791 general Operation set to INST_OP_UPDATE_INSTALL_PACKAGES
12.10.2006 13:56:31.000 1160675791 general Old version: 37c (892)
12.10.2006 13:56:31.000 1160675791 general SGW32P::CheckIfInstalled set m_bAlreadyInstalled to 1
12.10.2006 13:56:31.000 1160675791 internet SYNCER: Type: use IE settings
12.10.2006 13:56:31.000 1160675791 internet SYNCER: Auth: another authentication, use WinInet
12.10.2006 13:56:31.000 1160675791 package Part prg_av_pro-37c is installed
12.10.2006 13:56:31.000 1160675791 package Part vps-64103 is installed
12.10.2006 13:56:31.000 1160675791 package Part news-4b is installed
12.10.2006 13:56:31.000 1160675791 package Part setup_av_pro-37c is installed
12.10.2006 13:56:31.000 1160675791 general Old version: 37c (892)
12.10.2006 13:56:32.000 1160675792 file SetExistingFilesBitmap: 904->141->141
12.10.2006 13:56:32.000 1160675792 general GUID: d1a52436-062b-4fc2-8577-fdd9a75d09bc
12.10.2006 13:56:32.000 1160675792 general Entering:UpdateInstallPackages
12.10.2006 13:56:32.000 1160675792 package Load C:\Program Files\Alwil Software\Avast4\Setup\prod-av_pro.vpu
12.10.2006 13:56:32.000 1160675792 package LatestPartInfo: news = news-4b
12.10.2006 13:56:32.000 1160675792 package LatestPartInfo: program = prg_av_pro-37c
12.10.2006 13:56:32.000 1160675792 package LatestPartInfo: setup = setup_av_pro-37c
12.10.2006 13:56:32.000 1160675792 package LatestPartInfo: vps = vps-64103
12.10.2006 13:56:32.000 1160675792 package FilterOutExistingFiles: 141 & 141 = 0
12.10.2006 13:56:32.000 1160675792 package FilterOutExistingFiles: 141 & 141 = 0
12.10.2006 13:56:33.000 1160675793 package ArePartsInstallable: 1
12.10.2006 13:56:39.000 1160675799 package vps: updated [064103]
12.10.2006 13:56:40.000 1160675800 file Fix security on: C:\Program Files\Alwil Software\Avast4\*.*
12.10.2006 13:57:39.000 1160675859 file Fix security on: C:\Program Files\Alwil Software\Avast4\ENGLISH\*.*
12.10.2006 13:57:40.000 1160675860 file Fix security on: C:\Program Files\Alwil Software\Avast4\ENGLISH\HELP\*.*
12.10.2006 13:57:40.000 1160675860 file Fix security on: C:\Program Files\Alwil Software\Avast4\ENGLISH\HtmlData\*.*
12.10.2006 13:57:41.000 1160675861 file Fix security on: C:\Program Files\Alwil Software\Avast4\images\*.*
12.10.2006 13:57:41.000 1160675861 package Transferred files: 0
12.10.2006 13:57:41.000 1160675861 package Transferred bytes: 0
12.10.2006 13:57:41.000 1160675861 package Transfer time: 0 ms
12.10.2006 13:57:41.000 1160675861 file NeedReboot=false
12.10.2006 13:57:41.000 1160675861 general Return code: 0x20000000 [Something done]
12.10.2006 13:57:41.000 1160675861 general Stopped: 12.10.2006, 13:57:41