Why do I get ‘HTTP 500’ error (or ‘(DLL) initialization routine failed’) in my browser?

This is because if you have the /3GB boot switch enabled, the ASP.NET worker process (Aspnet_wp.exe) does not start. For more information see Microsoft Knowledge Base Article – 320353

To create and set the ‘ASPNETENABLE3GB’ environment variable as mentioned in the above article, right click MyComputer ->Properties->Advanced > Environment Variables > System variables > New.

Add the variable name in the top text box and the value in the lower textbox.