IIS7-win2008 server --403-- Forbidden: Access is denied. You are not authorized to use the credentials provided to view this directory or page.

Try to re-register at .net framework,

32-bit Windows:

1. Run -> cmd
2. cd C: \ Windows \ Microsoft.NET \ Framework \ v4.0.30319
3. aspnet_regiis.exe -I

64-bit Windows:

1. Run -> cmd
2. cd C: \ Windows \ Microsoft.NET \ Framework64 \ v4.0.30319
3. aspnet_regiis.exe -I