My hard drive is clicking constantly and every now and again the computer just freezes or crashes completely, when I manage to reboot it Windows always identifies it as a hard disk problem. Before you ask yes I've gone through all the scandisk type solutions with no lasting succes. I think I'll have no problem in fitting a new hard drive but will Windows see that I'm installing the OS on the same computer or will it kick me out thinking I've installed a single version of Vista on a second computer