My computer from PC World came with windows vista preinstalled. I had make a recovery dsk which I did. Recently I had to reinstall the OS. All went well untils the updates from microsoft were installed. Then on reboot I am told that my windows vista is not genuine and I am redirected MS home page to buy another OS. If the updates are not allow to load all is OK. Of course the security updates are essential. Spoke to MS and PC World and got no where. Can anyone help?