While testing the upgrade from NOD32 AV Business Edition ver. 4.0.474 to ver. 4.2.40 (on MS Win XP Pro. SP3 machines) using the push install in the Eset RA Console ver. 3.1.15 I encountered a problem. Post update: the MS Win XP Pro. computers are members of a MS Windows Domain. The user account used for push install was a domain admin account. On some machines the upgrade was unsuccessful. The failed installation status was: Failure during the package install - exit code: 1603 The einstaller.log is in the attachment. The logged on user received the following popup: "Installation of ESET NOD32 Antivirus will be run after a computer restart. Do you want to restart the computer now?" The restart resulted in NOD32 AV BE 4.2.40 installed but with antivirus protection disabled. The NOD32 GUI protection status window said: A serious error occurred while starting real-time file system protection. The computer is not protected against threats. The program needs to be reinstalled. ESET NOD32 Antivirus has been updated to a newer version. We recommend that you restart the computer.The user also noticed that she was unable to browse web pages (i.e. communication over HTTP was not working). After the second restart of Windows the AV protection was enabled and working fine. If I compare the cases of successful upgrade and the upgrade with the error, the following factor seems significant: If no user was logged on or a user with administrative rights in Windows was logged on, the upgrade was successful. If a normal user (without administrative rights) was logged on (either a local user or a domain user), the upgrade produced the above error and required two restarts of Windows to complete. This looks like a bug in the NOD32 AV installer. Has anyone experienced the same? -- rpr.