Hope someone can help..........running XP Pro SP3 and when I try and install Office 2007 I get an error towards the end of the install process

Error 1401 Setup cannot create the registry key \.xlsx\Excel.sheet.12\ShellNew

and then goes on about permissions. I have removed antivirus and spyware software as suggested in an MS article and done a clean boot but now I am stumped.

Any ideas?