- Most people use PHP on Linux for a variety of reasons, including performance, stability and ease of customization/installation.
- PHP 5.3 is very old. Can you use a newer version? (Note: the MSI installer isn't supplied in new versions. An unzip is just as good)
- If you are trying to install OCI8 with IIS, see https://blogs.oracle.com/opal/entry/how_to_use_iis_php_and_oracle