ASP.NET partially Running in IIS7

[php_noob]

First I apologize to the moderator, I am not sure if this is more than a WINDOWS 7 topic or IIS or a ASP.NET topic.

MY SETUP: WINDOWS 7 ULTIMATE + IIS 7 + WEB PLATFORM INSTALLER
+ XAMPP

MY IIS7 : RUNS in PORT8080
MY APACHE RUNS in PORT8070

I have VS2005 + MSSQLSERVER2005 + ASP.NET MVC 1.0 + .NET FRAMEWORKS SDK v2.0

ON VS2005 I have compatibility issues when I search online still and downloaded the SOFTWARE still the problem persists.

The bottomline, I want my APP work, I saw the login page but when I logged I get ERROR 500.

Thank you for the responses!