So the friend of mine got infected by nasty file infector-Sality.
So because I know Sality is impossible to clean when windows is active,I decided to format her system partition.
When format was completed I downloaded avast and ran the setup.
Everything seemed to be normal but in the end of the installation I got a screen which said : "There was an error while completing setup process". I ran aswclear in safe mode, then I tried to install avast again... I got the same error....
Here is the finish of the setup log....
20.04.201221:31:43file:Direct delete of file: C:\Program Files\AVAST Software\Avast\Setup\setup.ovr
20.04.201221:31:43file:Direct delete of file: C:\Program Files\AVAST Software\Avast\Setup\setup_ais-592.vpx
20.04.201221:31:43file:Direct delete of file: C:\Program Files\AVAST Software\Avast\Setup\vps_32-73f.vpx
20.04.201221:31:43file:Direct delete of file: C:\Program Files\AVAST Software\Avast\Setup\vps_win32-753.vpx
20.04.201221:31:43file:Direct delete of file: C:\Program Files\AVAST Software\Avast\Setup\winsys-5.vpx
20.04.201221:31:44package:Transferred: files 0, bytes 0, time 1703 ms
20.04.201221:31:44package:Retries: total 0, files 0, servers 1
20.04.201221:31:44general:GetLicNumber: LoadLibrary( C:\Program Files\AVAST Software\Avast\ashBase.dll ) return value: 0x00000000
20.04.201221:31:44general:Error: ashBase.dll (C:\Program Files\AVAST Software\Avast\ashBase.dll) could not be loaded
20.04.201221:31:44general:DldSrc set to inet
20.04.201221:31:44general:Server definition(s) loaded for 'main': 245 (maintenance:0)
20.04.201221:31:44general:SelectCurrent: selected server 'Download318 AVAST5 Server' from 'main'
20.04.201221:31:44internet:SYNCER: Type: use IE settings
20.04.201221:31:44internet:SYNCER: Auth: another authentication, use WinInet
20.04.201221:31:45internet:Sending stats 'http://stats7.avast.com/cgi-bin/iavs4stats.cgi': 00000000 204
20.04.201221:31:45general:Return code: 0x000036B1 [This application has failed to start because the application configuration is incorrect. Reinstalling the application may fix this problem.]
20.04.201221:31:45general:Stopped: 20.04.2012, 21:31:45
Please answer ASAP.