not2easy - 4:16 am on Dec 1, 2012 (gmt 0)
If the "small section" was a particular folder, you can go thru the steps to remove that folder. I've done it in the past but don't have a checklist of all the steps, it is not hard to do. The folder can not be blocked in robots.txt if you want to apply to remove it in GWT. If these were all individual pages then each would need to me removed. I have no idea how long it takes to accomplish, but it does stop the 404s.