My upgrade attempts on windows xp pro didn't succeed. All ESET kb articles regarding installation, reinstallation, uninstallation and clean-up procedures consulted and followed. Well, the installation process runs without any issue. But during the next OS reboot the problems start to exist. Windows boot screen (windows logo on black background) the system gets hanged up. Progress bar keeps to animate but hdd doesn't work. In this state the machine can stay for ages. Hard reset necessary. After that windows boot offers "last good". If this proposal not chosen the problem repeats. I noticed, that after having applied the ESET uninstaller/clean-up utility some NOD32 or ESET related entries are still present in registry. Primarily keys HKEY_LOCAL_MACHINE\SYSTEM\ControlSet0xx. Any idea about possible reason?