2 Did you make a Win 7 disc image before you attempted the upgrade?
3 Did your make a System Repair disc before attempting the upgrade?
4 Can you get to a command prompt?
5 Are you happy that everything that is important to you on your machine (docs, photos, music, films, downloaded executables, product serial codes etc are safely copied to removable media and are easily reproducible?
6 Post back with the above and the make and model number of your computer and we will do our best to help