I just downloaded the 5.0.149.4 and it's works fine. I try agan with the 5.0.121 .... nothing (i just change the name of the exe, nothing else). Maybe this version was corrupt ? I don't know. @r0sWell : I notice this line : REG ADD %KEY%\090 /V 3 /D "%systemdrive%\Softwares\Kaspersky\update.exe" /f I suppose is for the last cumulative update, but on the kaspersky site i only find the zip file : avp0409.zip. I can made a SFX of this archive but what path should i put in the default dir ? Before in the 4.xx version, there was a base dir ... i don't him at this time ! Thk a lot