But, as you said, there appears to be no problem with the installation
:31:14 vrb/gen License key generated
13:31:30 vrb/reg Set registry: Software\Alwil Software\Avast\4.0\Label=Feb2009
13:31:30 vrb/reg Set registry: Software\Alwil Software\Avast\4.0\Avast4DataFolder=C:\Program Files\Alwil Software\Avast4\DATA
13:31:30 vrb/reg Set registry: Software\Alwil Software\Avast\4.0\Avast4SkinFolder=C:\Program Files\Alwil Software\Avast4\DATA\Skin
13:31:30 vrb/reg Set registry: Software\Alwil Software\Avast\4.0\Version=4.8
13:31:30 vrb/reg Set registry: Software\Alwil Software\Avast\4.0\VersionShort=4.8
13:31:30 vrb/reg Set registry: Software\Alwil Software\Avast\4.0\SetupVersion=1335
13:31:30 vrb/reg Set registry: Software\Alwil Software\Avast\4.0\Avast4ProgramFolder=C:\Program Files\Alwil Software\Avast4
13:31:30 vrb/reg Set registry: Software\Alwil Software\Avast\4.0\Product=av_pro
13:31:30 vrb/reg Set registry: Software\Alwil Software\Avast\4.0\OSPlatform=2
13:31:30 vrb/reg Set registry: Software\Alwil Software\Avast\4.0\OSVersion=327682
13:31:30 nrm/pkg Transferred: files 0, bytes 0, time 0 ms
13:31:30 nrm/pkg Retries: total 0, files 0, servers 1
13:31:30 vrb/fil NeedReboot=true
13:31:30 vrb/sys Delete on reboot(C:\PROGRA~1\ALWILS~1\Avast4\Setup\reboot.txt)
13:31:30 nrm/fil Direct delete of file: C:\DOCUME~1\Damon\LOCALS~1\Temp_av_sfx.tm~a02368\avast.setup
13:31:30 nrm/fil Direct delete of file: C:\DOCUME~1\Damon\LOCALS~1\Temp_av_sfx.tm~a02368\avscan-360.vpu
13:31:30 nrm/fil Direct delete of file: C:\DOCUME~1\Damon\LOCALS~1\Temp_av_sfx.tm~a02368\av_pro_core-4d6.vpu
13:31:30 nrm/fil Direct delete of file: C:\DOCUME~1\Damon\LOCALS~1\Temp_av_sfx.tm~a02368\av_pro_dll409-1a4.vpu
13:31:30 nrm/fil Direct delete of file: C:\DOCUME~1\Damon\LOCALS~1\Temp_av_sfx.tm~a02368\av_pro_hlp409-3b0.vpu
13:31:30 nrm/fil Direct delete of file: C:\DOCUME~1\Damon\LOCALS~1\Temp_av_sfx.tm~a02368\av_pro_skins-14.vpu
13:31:30 nrm/fil Direct delete of file: C:\DOCUME~1\Damon\LOCALS~1\Temp_av_sfx.tm~a02368\jollyroger.vpu
13:31:30 nrm/fil Direct delete of file: C:\DOCUME~1\Damon\LOCALS~1\Temp_av_sfx.tm~a02368\jrog-b3.vpu
13:31:30 nrm/fil Direct delete of file: C:\DOCUME~1\Damon\LOCALS~1\Temp_av_sfx.tm~a02368\news409-32.vpu
13:31:30 nrm/fil Direct delete of file: C:\DOCUME~1\Damon\LOCALS~1\Temp_av_sfx.tm~a02368\part-jrog-b3.vpu
13:31:30 nrm/fil Direct delete of file: C:\DOCUME~1\Damon\LOCALS~1\Temp_av_sfx.tm~a02368\part-news-4b.vpu
13:31:30 nrm/fil Direct delete of file: C:\DOCUME~1\Damon\LOCALS~1\Temp_av_sfx.tm~a02368\part-prg_av_pro-537.vpu
13:31:30 nrm/fil Direct delete of file: C:\DOCUME~1\Damon\LOCALS~1\Temp_av_sfx.tm~a02368\part-setup_av_pro-537.vpu
13:31:30 nrm/fil Direct delete of file: C:\DOCUME~1\Damon\LOCALS~1\Temp_av_sfx.tm~a02368\part-vps-9020501.vpu
13:31:30 nrm/fil Direct delete of file: C:\DOCUME~1\Damon\LOCALS~1\Temp_av_sfx.tm~a02368\prod-av_pro.vpu
13:31:30 nrm/fil Direct delete of file: C:\DOCUME~1\Damon\LOCALS~1\Temp_av_sfx.tm~a02368\servers.def
13:31:30 nrm/fil Direct delete of file: C:\DOCUME~1\Damon\LOCALS~1\Temp_av_sfx.tm~a02368\servers.def.vpu
13:31:30 nrm/fil Direct delete of file: C:\DOCUME~1\Damon\LOCALS~1\Temp_av_sfx.tm~a02368\setif_av_pro-537.vpu
13:31:30 nrm/fil Direct delete of file: C:\DOCUME~1\Damon\LOCALS~1\Temp_av_sfx.tm~a02368\setup.ovr
13:31:30 nrm/fil Direct delete of file: C:\DOCUME~1\Damon\LOCALS~1\Temp_av_sfx.tm~a02368\setup_av_pro-537.vpu
13:31:30 nrm/fil Direct delete of file: C:\DOCUME~1\Damon\LOCALS~1\Temp_av_sfx.tm~a02368\vps-9020500.vpu
13:31:30 nrm/fil Direct delete of file: C:\DOCUME~1\Damon\LOCALS~1\Temp_av_sfx.tm~a02368\vpsm-9020501.vpu
13:31:30 nrm/fil Direct delete of file: C:\DOCUME~1\Damon\LOCALS~1\Temp_av_sfx.tm~a02368\winsys-2.vpu
13:31:30 nrm/fil Direct delete of file: C:\DOCUME~1\Damon\LOCALS~1\Temp_av_sfx.tm~a02368\winsysgui-2.vpu
13:31:30 vrb/fil MoveFileEx(C:\PROGRA~1\ALWILS~1\Avast4\Setup\reboot.txt, NULL)
13:31:30 min/gen Return code: 0x20000000 [Something done]
13:31:30 min/gen Stopped: 12.03.2009, 13:31:30
I did the forced installation and edited the setup.ini
I also tried turning the firewall off and doing an update… still no go.