Had the same issue on my machine. Running XP SP3. Got the prompt to update, did so, waited on the restart until I was done for the night. Restarted, got the prompt on restart to finish the installation. Restarted, then shut down. Once I started the computer up the next day, it was freezing in random places. First on the login screen, then on the programs loading in my system tray, and finally when I tried to load Chrome. Booted into safe mode, uninstalled, everything was fine. Reinstalled, same freezing issues happened, though it did allow me to get past the windows login screen. Booted into safe mode, uninstalled just the Behavior Scanner thingy and the web rep. So far, things seem to be okay, though I definitely don't like the idea of going without either. Gonna try to grab the older version from another one of my machines. Will post a link if I find the install file.