Delete automatically generated RSS feed

I’m sure this answer is obvious, but I can’t seem to find it…

I am a totally NB to web site creation but have actually managed to put one together! I have created 2 category specific RSS feeds and linked to the respective “subscribe to” pages in my sidebar. However, when you go my home page, in the IE bar at the top, the user is offered the option of subscribing to my “feed”, which is an aggregate of both feeds in date order. This is precisely what I didn’t want to have happen, which is why I created the 2 other specific feeds.

It seems to me that WP has automatically generated this feed, along with one for the comments. (Incidentally, I have no comments, so a 404 error comes up when I click on that link.)

How can I delete them both? I don’t care if that means that the link in the IE explorer bar will come up empty.

Thanks so much!