I personally use (and recommend)
Ubuntu Server 8.04 LTS (until 10.04 LTS comes out in April + a few months of debugging).
You can setup a full blown LAMP (Linux + Apache + MySQL + PHP) server in minutes.
You can also install
Webmin for a web-based configuration and monitoring tool (useful for noobs and experts alike).
I don't believe in Windows webservers.
PS. Les suggestions du "ti-coune" (

) étaient bonnes, mais BSD c'est du trouble a configurer pour un noob! Mais BSD (et FreeBSD) = sécurité totale.