SQL Server 2008 R2 Express安装失败，sql100exception对sqlenginedbstartconfig_install_configrc。

I'm trying to install SQL Server 2008 R2 Express on Win XP Sp3 machine (with .net 3.5 sp1, .net 4) and getting this exception (after ~20 installations on similar configurations in the last two weeks): I'm trying to install SQL Server 2008 R2 Expres