proxy needs authentication !!! can´t update !!! TROJAN?

I´m using version 4.7.1001 and I can´t update virus database and program since some days now… I get a very strange error, like this “The proxy needs authentication”. Is it a trojan or something that is preventing my updates?

The strange thing is I do not use any proxy, and my internet connection parameters or anything didn´t change last few days.

Does anyone gets an error message like this? I´ve tried to look into avast site, and google, and it seems like no one gets this error…???

OK, maybe this can help… This is the update log avast generated.

02.08.2007 19:13:41 general: Started: 02.08.2007, 19:13:41
02.08.2007 19:13:41 general: Running setup_av_pro-3e9 (1001)
02.08.2007 19:13:41 system: Operating system: WindowsXP ver 5.1, build 2600, sp 2.0 [Service Pack 2]
02.08.2007 19:13:41 system: Computer WinName: HOMESTUDIO
02.08.2007 19:13:41 system: Windows Net User: HOMESTUDIO\Rafa
02.08.2007 19:13:41 general: Cmdline: /downloadpkgs /noreboot /updatevps /silent /progress
02.08.2007 19:13:41 general: DldSrc set to inet
02.08.2007 19:13:41 general: Operation set to INST_OP_UPDATE_GET_PACKAGES
02.08.2007 19:13:41 general: Old version: 3e9 (1001)
02.08.2007 19:13:42 general: SGW32P::CheckIfInstalled set m_bAlreadyInstalled to 1
02.08.2007 19:13:42 system: Computer DnsName: homestudio
02.08.2007 19:13:42 system: Computer Ip Addr: 192.168.0.2
02.08.2007 19:13:42 internet: SYNCER: Proxy proxy.cruiser.com.br:3128
02.08.2007 19:13:42 internet: SYNCER: Type: standard HTTP proxy (rfc2616,2617)
02.08.2007 19:13:42 internet: SYNCER: Auth: no authentication
02.08.2007 19:13:42 package: Part prg_av_pro-3e9 is installed
02.08.2007 19:13:42 package: Part vps-76300 is installed
02.08.2007 19:13:42 package: Part news-4b is installed
02.08.2007 19:13:42 package: Part setup_av_pro-3e9 is installed
02.08.2007 19:13:42 package: Part jrog-7 is installed
02.08.2007 19:13:42 general: Old version: 3e9 (1001)
02.08.2007 19:13:42 file: SetExistingFilesBitmap: 1024->145->145
02.08.2007 19:13:42 general: GUID: acda67fe-e3f4-4bb3-b7b1-eb4f390b7f79
02.08.2007 19:13:42 general: Server definition(s) loaded for ‘main’: 146 (maintenance:0)
02.08.2007 19:13:42 general: SelectCurrent: selected server ‘Download83 AVAST server’ from ‘main’
02.08.2007 19:13:42 package: GetPackages - set proxy for inet
02.08.2007 19:13:42 internet: SYNCER: Proxy proxy.cruiser.com.br:3128
02.08.2007 19:13:42 internet: SYNCER: Type: standard HTTP proxy (rfc2616,2617)
02.08.2007 19:13:42 internet: SYNCER: Auth: no authentication
02.08.2007 19:13:42 internet: SYNCER: Proxy l/p: thania/***
02.08.2007 19:13:42 general: Entered SetupProcessPro::Do( INST_OP_UPDATE_GET_PACKAGES )
02.08.2007 19:13:42 general: Entered SetupProcessWin32Avast::Do( INST_OP_UPDATE_GET_PACKAGES )
02.08.2007 19:13:42 general: Entered SetupProcessWin32::Do( INST_OP_UPDATE_GET_PACKAGES )
02.08.2007 19:13:42 general: Entered SetupProcess::Do( INST_OP_UPDATE_GET_PACKAGES )
02.08.2007 19:13:42 general: progress thread start
02.08.2007 19:13:42 general: progress start - 1
02.08.2007 19:13:42 general: progress start - 2
02.08.2007 19:13:43 package: Download servers.def, servers.def.vpu failed with error 0x20000005.
02.08.2007 19:13:43 package: Tried to download servers.def but failed with error 0x20000005.
02.08.2007 19:13:43 general: progress end - 1
02.08.2007 19:13:43 general: progress end - 0
02.08.2007 19:13:43 general: progress thread end
02.08.2007 19:13:43 general: Err:The proxy needs authentication