Compiling PHP, Running PHP4/5 Simultaneously & Tracking Down IIS

Greetings! My first question is what other possibilities there are for compiling PHP under Windoze besides MSVS. I am a high-schooler (think no $$$ :-) and besides not being able to afford MSVS I don't have much love lost on Microsoft. So, I was hoping there might be a cheaper way to go... (What I'd really LIKE to do is turn our PC into a dual-boot machine, but Dad's not so keen on that.) For my second question I was wondering if it is possible to run PHP4 and PHP5 modules simltaneously under Apache -- current configuration Apache 2.0.43, PHP 4.3.0 (module), MySQL 4.06-gamma (I'd like to give the PHP5 pages a *.php5 extension or something like that). Looking at the documentation I'm not really sure how this could happen, but I'm hopeful... My last question is where I might be able to come up with IIS for WindozeXP. We have an HP which didn't come with any system disk -- and it doesn't exist under "Add/Remove Programs" -> "Windows Components" like it should. I haven't been able to turn it up ANYWHERE on the internet, so any help would be appreciated. -- Jason