Performing web queries on excel

I was wondering if someone out there is familar with performing queries on Excel? I have designed an excel spreadshett that does web queries on the web. The problem I am having is that it works great the 1st time around but after a short period of time the web querry data shifts and my links from the querry doesn't show the correct data. I have researched the web and looked for any books and I cannot find a solution. I was wondering if there is a simple answer to this. Can you anyone help?

Chris