Unfortunately it was my back up the was the problem there must have been a corrupt file that had affected the O S. I realised this after doing a complete rebuild twice and downloading the updates until it came to the service Pack 1 and still the darn thing would not install it that also would not download hot fix KB947821. At that point I nearly picked the PC up and throw it through the window, I realised that it happened after I downloaded my files from the external drive. So now I have started from scratch again and also deleted all the files from the external drive. So I have a lot of work re downloading all my music all 23gigs of it, still it will occupied for a while. The other good news I am back crunching. Thank you guy's for your advice.