I had extracted the file to C:\ as advised elsewhere but it would not relocate to Windows/System so I copied it across. This works but of course I now have the file in two places! Any ideas what to do with the spare? Is it spare? I presume that I can just delete it although I doubt if this will be allowed as the reason for copying it across was an error message saying that it could not be relocated as it was in use by Windows. At least things now work, many thanks.