Hello Hussam,
Just a thought, is the HDD partitioned ?, if it is, is there enough room for the installation, your not trying to put it in the wrong side of the partition, ( i have come across this before) check it out and post your result's. Also take a look here, follow the link.
http://www.ace-on-tech.com/2008/03/2...xe0000100-huh/