Microsoft Security Essentials?

I have been using AVG but it seems to not allow my window's defender to load at start up. I've read some good things about Microsoft Security Essentials as a free anti-virus program, but I was wondering what you all thought of the program. I'm not really sure what would be the best protection for this computer.

AVG is a good product. Paid versions have an option to disable windows defender during install. (Maybe even the free version) I haven't used AVG in quite a while, but it is a good product. I haven't heard anything bad about security essentials yet, but I have not used it.

Well I'm using AVG in combination with Windows Defender in both a Vista and a win7pro machine without any issues. I also use MSE on a Vista laptop and awin7pro desktop. I'm quite satisfied about MSE thusfar, but didn't encounter virusses yet, so how well it really protects remains to be seen…