If you have software that's dependant on IIs ( I assume asp, and .net would be), disregard this post.
You might want to look into one of the Apache/PHP/MySQL bundels available for Windows.
I do allot of work with PHP and have been using
Apache2triad for quite a while now. It's great - gives me PHP, MySQL, MyPhpAdmin, SSI, CGI Perl, Mod Perl, Apache::ASP, Python Spyce. The greatest thing about it is I don't have to configure anything - Just install it.
It may not be a good choice for you depending on what you're running on IIs.
Just thought I'd let you know what else is out there in case you didn't.