Just renewed the antivirus pro version we have because the subscription was running out on a system that was running XP Pro with SP3 on it. Now after installing it while avoiding installing Google chrome we can no longer boot this computer. It is on a network domain & it gets to the screen where you need to hit CTRL ALT DEL to get to the login screen. Once there it will not go any further. I tried this in both safe mode & normal mode. I also checked the use last known good configuration & it doesn't work that way either. Is Avast no longer supporting XP?