What is Windows Defender? Is it a virus protector? I heard its not good to run two of these at the same time. Defender just suddenly prompted me that it wasn't running, so I started it up. But I don't know how to turn it off, or if indeed I should. Seems to be slowing my computer down.

Any advice?
Staurm Reviewed by Staurm on . [VISTA] Windows Defender - advisable to use with Norton? What is Windows Defender? Is it a virus protector? I heard its not good to run two of these at the same time. Defender just suddenly prompted me that it wasn't running, so I started it up. But I don't know how to turn it off, or if indeed I should. Seems to be slowing my computer down. Any advice? Rating: 5