check the number of lines in the file wp-admin/includes/image.php - the total should be 599 lines.
I suspect your FTP upload of teh wordpress files timed out (did not complete) and you have a partial install. You have four choices
1) try ftp'ing the whole thing again
2) ftp the files in chunks
3) ftp the wordpress.zip file and then SSH into thesite and unzip it (you need to have SSH setup on the host)
4) I beleive GoDaddy has a script to install WordPress - use that