I have bought a new hard drive and followed the instructions supplied by dell to re install the op system you have to first put in the disc for dell media centre and this prepares the hard drive by installing partitions then you put in the disc for the op system it starts up ok and goes through the motions of installing drivers etc then it goes to finishing install there is a progression bar that moves across the screen then stops about 3/4 of the way across and then does no more am I missing out something like pre formatting the hard drive?