След рестарта отново я няма иконата.

Разбрах, че и без да рестартирам може да се появи иконата, но трябва при всяко пускане на компютъра от прекия път да стартирам главния прозорец на програмата и да махам отметката, давам ОК и после обратно да я сложа. Появява се веднага.
А за лог файла просто такава директория няма. Намерих нещо подобно на това което искаш и то е в: C:\Program Files\Alwil Software\Avast5\Setup
Ето последните няколко реда:
00:44:35 min/gen Started: 24.01.2010, 00:44:35
00:44:35 min/gen Running setup_ais-179 (377)
00:44:35 nrm/sys Operating system: WindowsXP ver 5.1, build 2600, sp 3.0 [Service Pack 3]
00:44:35 nrm/sys Memory: 75% load. Phys:112944/457712K free, Page:789104/1081528K free, Virt:2071292/2097024K free
00:44:35 vrb/sys Computer WinName: 6E25FB10208E495
00:44:35 min/sys Windows Net User: SYSTEM
00:44:35 min/gen Cmdline: /downloadpkgs /noreboot /silent /session "4"
00:44:35 vrb/gen DldSrc set to inet
00:44:35 vrb/gen Operation set to INST_OP_UPDATE_GET_PACKAGES
00:44:35 min/gen Old version: 179 (377)
00:44:36 vrb/reg Deleted registry: Software\Alwil Software\Avast\5.0\UpdateReady
00:44:36 nrm/sys Using temp: C:\WINDOWS\TEMP\_asw_aisI.tm~a02304 (2732M free)
00:44:36 nrm/gen SGW32AIS::CheckIfInstalled set m_bAlreadyInstalled to 1
00:44:36 nrm/int SYNCER: Agent=Syncer/5.00 (ais-377;p)
00:44:36 vrb/sys Computer DnsName: 6e25fb10208e495
00:44:36 vrb/sys Computer Ip Addr: 192.168.1.3
00:44:36 nrm/sys Installed in: C:\Program Files\Alwil Software\Avast5 (2732M free)
00:44:36 nrm/int SYNCER: Type: use IE settings
00:44:36 nrm/int SYNCER: Auth: another authentication, use WinInet
00:44:36 vrb/pkg Part prg_ais-179 is installed
00:44:36 vrb/pkg Part vps_win32-10012302 is installed
00:44:36 vrb/pkg Part setup_ais-179 is installed
00:44:36 vrb/pkg Part jrog-11 is installed
00:44:36 vrb/gen LoadState: Edition=1
00:44:36 min/gen Old version: 179 (377)
00:44:37 vrb/fil SetExistingFilesBitmap: 232->82->82
00:44:37 min/gen GUID: 76ce1d94-e9a2-46a9-9487-c3b04f8895e3
00:44:41 nrm/gen Server definition(s) loaded for 'main': 351 (maintenance:0)
00:44:41 nrm/gen SelectCurrent: selected server 'Download703 AVAST5 Server' from 'main'
00:44:41 nrm/int SYNCER: Type: use IE settings
00:44:41 nrm/int SYNCER: Auth: another authentication, use WinInet
00:44:41 nrm/int SYNCER: Agent=Syncer/5.00 (ais-377;p)
00:44:45 nrm/int Used server:
http://download703.avast.com/iavs5x00:44:45 min/fil GetFileWithRetry: servers.def.vpx downloaded .
00:44:45 min/fil servers.def.vpx not changed, 1263930396/0
00:44:49 nrm/gen Server definition(s) loaded for 'main': 351 (maintenance:0)
00:44:49 nrm/gen SelectCurrent: selected server 'Download721 AVAST5 Server' from 'main'
00:44:49 nrm/int SYNCER: Type: use IE settings
00:44:49 nrm/int SYNCER: Auth: another authentication, use WinInet
00:44:49 nrm/int Used server:
http://download721.avast.com/iavs5x00:44:49 min/fil GetFileWithRetry: prod-ais.vpx downloaded .
00:44:49 min/fil prod-ais.vpx not changed, 1264271119/0
00:44:49 min/pkg LoadProductVpu: C:\Program Files\Alwil Software\Avast5\Setup\prod-ais.vpx
00:44:49 vrb/pkg LoadPartInfo: jrog = jrog-11 returned 00000000
00:44:49 vrb/pkg LoadPartInfo: program = prg_ais-179 returned 00000000
00:44:49 vrb/pkg LoadPartInfo: setup = setup_ais-179 returned 00000000
00:44:49 vrb/pkg LoadPartInfo: vps = vps_win32-10012302 returned 00000000
00:44:49 min/pkg LoadProductVpu: C:\Program Files\Alwil Software\Avast5\Setup\prod-ais.vpx ended with 00000000
00:44:49 min/gen CheckLicProduct == _SETUP_AV_FREE
00:44:49 min/gen pfnLicValidateKey return value: 0x00000000
00:44:49 vrb/pkg FilterOutExistingFiles: 82 & 82 = 0
00:44:50 vrb/pkg FilterOutExistingFiles: 82 & 82 = 0
00:44:51 vrb/pkg FilterOutExistingFiles: 82 & 82 = 0
00:44:51 min/gen m_bOperationDidSomething 82/82/0
00:44:51 vrb/pkg FilterOutExistingFiles: 82 & 82 = 0
00:44:51 vrb/pkg FilterOutExistingFiles: 82 & 82 = 0
00:44:51 min/int submit has nothing to send
00:44:51 nrm/pkg Submit: files 0, bytes 0, time 0 ms
00:44:51 nrm/pkg Submit success: files 0, bytes 0, time 0 ms
00:44:51 nrm/pkg Transferred: files 2, bytes 5105, time 5037 ms
00:44:51 nrm/pkg Retries: total 0, files 0, servers 2
00:44:51 vrb/fil NeedReboot=false
00:44:51 min/gen Return code: 0x20000001 [Nothing done]
00:44:51 min/gen Stopped: 24.01.2010, 00:44:51