Hi,
This looks like you may need to comment out these in your php.ini file. They each refer to database software, Oracle, pgsql and SQLlite. I have never run PHP on IIS but this may be something to do with connectors. I would think that by uncommenting these out you may get some joy.
If that doesn't work maybe the path to your extensions directory is wrong, or your php.ini file may not be in the right directory. Normally you would find it in C:\Windows\ but with IIS I think you need to make sure in the registry that you have the location defined correctly.
As I said I haven't used PHP with IIS but I seem to remember that the HKEY_LOCAL_MACHINE\SOFTWARE\PHP\IniFilePath Windows Registry location is the one you need.
If this helps great if not sorry.