I think what happened is your blog used to be on the home page and you moved it to a new blog page and this broke the friendly url for your feed.
The friendly url for your feed is blog88rss.aspx and the friendly url maps to /RSS.aspx?pageid=x&mid=y
but since the friendly url was created when your blog lived on pageid=0 it is broken now that your blog is on a different page with pageid=75
You can fix it if you go to Administration Menu > Url Manager, you can find the friendly url blog88rss.aspx and fix the pageid part of the real url.
Hope it helps,