>It is a very simple sheet without any kind of macro
>just 5 columns firstname, lastname extension1 and extension2 no more than this,
>howerver I noticed that it's happening with every excel sheet I try with cvs, text file it work perfectly except with excel
>while I use microsoft office 2007 but I made sure that I am saving in the correct format excel 5 and still does not respond does this have something to do windows 7
>thank you

To answer your own question, try to import the same spreadsheet under XP.