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Just FYI afterthoughts on XAMPP:
I just visited the XAMPP website and they too have an archive of past versions from which one could just copy the PHP folder in the version with PHP 5.3.
XAMPP is fit only as a dev server, never for production. Because of all the goodies it comes bundled with, there are many opportunities for exploits. But it can be hardened to close them up. XAMPP also does not support 64 bit implementation, which I cannot understand.
Unfortunately, neither XAMPP or WAMP PHP implementations include the Suhosin php security patch, and Suhosin patch exists only for installation on Linux hosted servers.