I'm having a problem installing Windows Defender 64 on my XP64 box at work. It's the bottom system in my sig. Whenever I run the installer, it goes as far as the installing services part, and gives me an error that I don't have the proper credentials. Not only am I am admin on the box, but I'm an admin on the domain as well. I haven't tried to install it as the local built-in admin account, but has anyone else come across this?