Error trying to install SQL Server 2012 SP1

Hi,

I'm trying to install SQL Server 2012 SP1 Standard x64 onto Windows 7 SP1 x64 Ultimate but I'm getting the following error:

    SQL Server Setup has encountered the following error:

    Error occured while saving setting RSINSTALLMODE to configuration file C:\Program Files\Microsoft\SQL Server\110\Setup Bootstrap\Log\20130330_070131\ConfigurationFile.ini.

    Error code 0x84C90001.

I used to have SQL Server 2008 R2 on this machine but I uninstalled it and now trying to install SQL Server 2012 SP1.  I also have Visual Studio 2010 and Visual Studio 2012 installed on this same machine.

Any ideas/suggestions how to get past this error?

Thanks!
Greg