I formated the C:drive (100GB) to setup a new windows 7 on it and when the windowsa setup started , the partitons of my hard drive apeared to choose the drive which the windows will be installed on (C) but i found the (C) an unallocated space because i clicked delet on it before i click next and after that when i choose the (C) a text cpmes up " windows cant be installed on this drive because it dosn't contain the required free space . What can i do to successfully setup the windows 7 on tjis drive