If you want to improve your experience reading feeds with Internet Explorer 7 then you can try Feeds Plus. Feeds Plus is a freeware add-on for IE7 which will make your feed reading experience very efficient. You can easily aggregate your feeds and read them easily. You will also get a pop-up notification when there are new feeds for you to read.
With Feeds Plus you can aggregate the feeds into groups for your convenience. You can also use the feed reading controls like search, sort and filter on the aggregated feeds. You can choose either to show the pop-up for all the new feeds or only for particular feeds.