Hi Dev,

Thanks for that, I did try uninstalling all components, reboot the machine and try again and still got this error, but i didn't clear out the SQL Server directory when i did that, so i could try that but wonder if anyone else has any suggestions before going down this root.

The user i installed as is a local administrator on the PC.

I used to have SQL Server 2005 developer on the machine but uninstalled that completely before installing 2008 R2.

Thanks,

Simon