i have same problem, please help
24.10.2010 18:32:08 general: Started: 24.10.2010, 18:32:08
24.10.2010 18:32:08 general: Running setup_ais-2a5 (677)
24.10.2010 18:32:08 system: Operating system: Windows 7 ver 6.1, build 7600, sp 0.0 SERVER x64
24.10.2010 18:32:08 system: Memory: 46% load. Phys:2259552/4193576K free, Page:4194303/4194303K free, Virt:2026760/2097024K free
24.10.2010 18:32:08 system: Computer WinName: PC
24.10.2010 18:32:08 system: Windows Net User: PC\Robert
24.10.2010 18:32:08 general: Cmdline: /sfx /sfxstorage "C:\Users\Robert\AppData\Local\Temp\_av_sfx.tm~a00304" /srcpath "C:\PROGRA~2\BitLord\DOWNLO~1\AVAST!~1.677\AVAST!~1.677" /sfxname "setup_av_pro"
24.10.2010 18:32:08 general: DldSrc set to sfx
24.10.2010 18:32:08 general: Old version: ffffffff (-1)
24.10.2010 18:32:08 registry: Deleted registry: Software\Alwil Software\Avast\5.0\UpdateReady
24.10.2010 18:32:08 general: Install check: SetupVersion does NOT exist
24.10.2010 18:32:08 general: SGW32AIS::CheckIfInstalled set m_bAlreadyInstalled to 0
24.10.2010 18:32:08 registry: Get registry: Software\Microsoft\Internet Explorer\Version=8.0.7600.16385
24.10.2010 18:32:08 general: Error:Your operating system does not meet the minimum requirements. You can install avast! only on Windows 2000 with Service Pack 4 or higher.