Upgrading PHP on Windows 2003 IIS 6.0

[stesin]

Hi,

I currently run Windows 2003 server with IIS 6.0 using PHP 4.3.10 and need to upgrade to minimum 4.3.11 if not higher. I can't move to PHP 5 at present.

Is there a resource anyone could point me to or let me know what is the best way to do this.

If I run the installer without uninstalling the current version of PHP would it simply update the existing components and keep the permissions I have allocated to the files? Or screw everything up!

Could anyone offer their experience?

Thanks for your help

Cheers

Steve