I have Windows7 64-bit and I cant uninstall/reinstall.
Here’s a copy/paste of my setup log:
14.04.2010 01:33:45 general: Started: 14.04.2010, 01:33:45 14.04.2010 01:33:45 general: Running setup_ais-1a2 (418) 14.04.2010 01:33:45 system: Operating system: Windows Vista ver 6.0, build 6000, sp 0.0 x64 14.04.2010 01:33:45 system: Memory: 26% load. Phys:1048575/1048575K free, Page:1048575/2097151K free, Virt:2009816/2097024K free 14.04.2010 01:33:45 system: Computer WinName: GRAPHICS-PC 14.04.2010 01:33:45 system: Windows Net User: Graphics-PC\Graphics 14.04.2010 01:33:45 general: Cmdline: /uninstwiz 14.04.2010 01:33:45 general: Old version: 1a2 (418) 14.04.2010 01:33:45 registry: Deleted registry: Software\Alwil Software\Avast\5.0\UpdateReady 14.04.2010 01:33:45 system: Using temp: C:\Users\Graphics\AppData\Local\Temp\_asw_aisI.tm~a03420 (394025M free) 14.04.2010 01:33:45 general: SGW32AIS::CheckIfInstalled set m_bAlreadyInstalled to 1 14.04.2010 01:33:45 general: DldSrc set to inet 14.04.2010 01:33:45 internet: SYNCER: Agent=Syncer/5.00 (ais-418;p) 14.04.2010 01:33:45 system: Computer DnsName: Graphics-PC 14.04.2010 01:33:45 system: Computer Ip Addr: 192.168.16.14 14.04.2010 01:33:46 system: Installed in: C:\Program Files\Alwil Software\Avast5 (394025M free) 14.04.2010 01:33:46 internet: SYNCER: Type: use IE settings 14.04.2010 01:33:46 internet: SYNCER: Auth: another authentication, use WinInet 14.04.2010 01:33:46 package: Part prg_ais-1ce is installed 14.04.2010 01:33:46 package: Part vps_win32-10041400 is installed 14.04.2010 01:33:46 package: Part setup_ais-1ce is installed 14.04.2010 01:33:46 package: Part jrog-9a is installed 14.04.2010 01:33:46 general: LoadState: Edition=1 14.04.2010 01:33:46 general: Old version: 1a2 (418) 14.04.2010 01:33:46 file: SetExistingFilesBitmap: 280->99->99 14.04.2010 01:33:46 general: GUID: 177e1e61-d16c-4064-a802-8d67fe9b1ed3 14.04.2010 01:33:46 general: Server definition(s) loaded for 'main': 334 (maintenance:0) 14.04.2010 01:33:46 general: SelectCurrent: selected server 'Download701 AVAST5 Server' from 'main' 14.04.2010 01:33:46 internet: SYNCER: Type: use IE settings 14.04.2010 01:33:46 internet: SYNCER: Auth: another authentication, use WinInet 14.04.2010 01:33:51 general: Operation set to INST_OP_UNINSTALL 14.04.2010 01:33:51 general: Entered SetupProcessAIS::Do( INST_OP_UNINSTALL ) 14.04.2010 01:33:51 general: Entered SetupProcessWin32Avast::Do( INST_OP_UNINSTALL ) 14.04.2010 01:33:52 package: Transferred: files 0, bytes 0, time 0 ms 14.04.2010 01:33:52 package: Retries: total 0, files 0, servers 1 14.04.2010 01:33:53 internet: Sending stats 'http://download701.avast.com/cgi-bin/iavs4stats.cgi': 00000000 204 14.04.2010 01:33:53 file: NeedReboot=false 14.04.2010 01:33:53 general: Return code: 0x000004C7 [The operation was canceled by the user.] 14.04.2010 01:33:53 general: Stopped: 14.04.2010, 01:33:53