Fire Fox wont Download

My problem is a lot of times fire fox won't allow me to download or open files. It will open the window to select weather to save or open file. then it will only allow a selection of cancel. Usually links that are redirected but not always and it don't always do it. Some links I can select cancel then re-click it and it will allow me to download the file.

Is there a way to disable opening of files I am overlooking

Firefox 2.0.0.3

Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.3) Gecko/20070309 Firefox/2.0.0.3

Thanks Just anoying and I hat IE