I purchased an XPS 1530 Vista laptop last May which came with this AV program preinstalled with 2 years of activation. It has run fine up until a week ago. Now it is giving 2 errors. It says that the Personal Firewall and Unauthorized Change Protection Service are not running and there is a yellow triangle with an exclamation point on the TM icon in the system tray. I contacted TM support and they said that their software can not be run along with Windows Defender which makes no sense because that's the way it came from Dell and it's been running that way for 10 months. I disabled Windows Defender anyway's but it did not help. They had me uninstall/reinstall the Personal Firewall through their software error manager, but it did not solve the problem either. Has anyone else here with this software experienced these problems? I completely uninstalled and reinstalled the program as well with no success. Does Dell know something about this software that Trend Micro does not?