Okay not sure what to do. I've copied and pasted the last section of original file onto this post, hope it's not too much:
17:24:18 min/gen Started: 01.12.2010, 17:24:18
17:24:18 min/gen Running setup_ais-2a5 (677)
17:24:18 nrm/sys Operating system: Windows Vista ver 6.0, build 6002, sp 2.0 [Service Pack 2] x64
17:24:18 nrm/sys Memory: 36% load. Phys:2660696/4192592K free, Page:4194303/4194303K free, Virt:2048264/2097024K free
17:24:18 vrb/sys Computer WinName: NICK-PC
17:24:18 min/sys Windows Net User: SYSTEM
17:24:18 min/gen Cmdline: /checkupdate /verysilent
17:24:18 vrb/gen DldSrc set to inet
17:24:18 vrb/gen Operation set to INST_OP_CHECK_UPDATE
17:24:18 min/gen Old version: 2a5 (677)
17:24:18 vrb/reg Deleted registry: Software\Alwil Software\Avast\5.0\UpdateReady
17:24:18 nrm/sys Using temp: C:\Windows\TEMP\_asw_aisI.tm~a01360 (178624M free)
17:24:18 nrm/gen SGW32AIS::CheckIfInstalled set m_bAlreadyInstalled to 1
17:24:18 nrm/int SYNCER: Agent=Syncer/5.00 (ais-677;p)
17:24:18 vrb/sys Computer DnsName: Nick-PC
17:24:18 vrb/sys Computer Ip Addr: 192.168.0.4
17:24:18 nrm/sys Installed in: C:\Program Files\Alwil Software\Avast5 (178624M free)
17:24:18 nrm/int SYNCER: Type: use IE settings
17:24:18 nrm/int SYNCER: Auth: another authentication, use WinInet
17:24:18 vrb/pkg Part prg_ais-2a5 is installed
17:24:18 vrb/pkg Part vps_win32-10120100 is installed
17:24:18 vrb/pkg Part setup_ais-2a5 is installed
17:24:18 vrb/pkg Part jrog-a7 is installed
17:24:18 vrb/pkg Part jrog2-b8 is installed
17:24:18 vrb/gen LoadState: Edition=1
17:24:18 min/gen Old version: 2a5 (677)
17:24:18 vrb/fil SetExistingFilesBitmap: 479->103->103
17:24:18 min/gen GUID: b6c08255-f187-45cf-b847-f4f0772f12a4
17:24:18 nrm/gen Server definition(s) loaded for 'main': 384 (maintenance:0)
17:24:18 nrm/gen SelectCurrent: selected server 'Limelight 002 AVAST5 Server' from 'main'
17:24:18 nrm/int SYNCER: Type: use IE settings
17:24:18 nrm/int SYNCER: Auth: another authentication, use WinInet
17:24:18 nrm/int Used server:
http://ll002.avast.com/iavs5x17:24:18 min/fil GetFileWithRetry: servers.def.vpx downloaded .
17:24:18 min/fil servers.def.vpx not changed, 1291199024
17:24:18 nrm/gen Server definition(s) loaded for 'main': 384 (maintenance:0)
17:24:18 nrm/gen SelectCurrent: selected server 'Limelight 002 AVAST5 Server' from 'main'
17:24:18 nrm/int SYNCER: Type: use IE settings
17:24:18 nrm/int SYNCER: Auth: another authentication, use WinInet
17:24:18 nrm/int Used server:
http://ll002.avast.com/iavs5x17:24:18 min/fil GetFileWithRetry: prod-ais.vpx downloaded .
17:24:18 min/fil prod-ais.vpx not changed, 1291196014
17:24:18 min/pkg LoadProductVpu: C:\Program Files\Alwil Software\Avast5\Setup\prod-ais.vpx
17:24:18 vrb/pkg LoadPartInfo: jrog = jrog-a7 returned 00000000
17:24:18 vrb/pkg LoadPartInfo: jrog2 = jrog2-b8 returned 00000000
17:24:18 vrb/pkg LoadPartInfo: program = prg_ais-2a5 returned 00000000
17:24:18 vrb/pkg LoadPartInfo: setup = setup_ais-2a5 returned 00000000
17:24:18 vrb/pkg LoadPartInfo: vps = vps_win32-10120100 returned 00000000
17:24:18 min/pkg LoadProductVpu: C:\Program Files\Alwil Software\Avast5\Setup\prod-ais.vpx ended with 00000000
17:24:18 vrb/reg Set registry: Software\Alwil Software\Avast\5.0\Label=Jan2010
17:24:18 vrb/reg Set registry: Software\Alwil Software\Avast\5.0\DataFolder=C:\ProgramData\Alwil Software\Avast5
17:24:18 vrb/reg Set registry: Software\Alwil Software\Avast\5.0\Version=5.0
17:24:18 vrb/reg Set registry: Software\Alwil Software\Avast\5.0\VersionShort=5.0
17:24:18 vrb/reg Set registry: Software\Alwil Software\Avast\5.0\SetupVersion=677
17:24:18 vrb/reg Set registry: Software\Alwil Software\Avast\5.0\ProgramFolder=C:\Program Files\Alwil Software\Avast5
17:24:18 vrb/reg Set registry: Software\Alwil Software\Avast\5.0\Product=ais
17:24:19 nrm/pkg Transferred: files 2, bytes 0, time 172 ms
17:24:19 nrm/pkg Retries: total 0, files 0, servers 2
17:24:19 vrb/fil NeedReboot=false
17:24:19 min/gen Return code: 0x20000001 [Nothing done]
17:24:19 min/gen Stopped: 01.12.2010, 17:24:19