Hi all, This works for me NoBoot.reg -------------------------------------------------------------------- Windows Registry Editor Version 5.00 [HKEY_LOCAL_MACHINE\SOFTWARE\KasperskyLab\AVP6\Data] "LastStart"=dword:00000000 -------------------------------------------------------------------- And after, I use this comand line start /wait kav6.0.0.303es.msi /li /quiet /qn /norestart INSTALLDIR="%ProgramFiles%\Internet\Virus\Kaspersky Anti-Virus 6.0\" /qn REBOOT=ReallySuppress It installs and starts, but no reboot the PC. Hope this helps.