If you received error like in title while trying to install php 5.2.8, then read this, maybe it wil be helpfull for you too :)

Mostly I followed instructions from here, my problem was that I had installed IIS 5.1 and IIS 6... Have no idea how that happened.

If you start msi instalation of php to change anything, than you will probably have to go to IIS manager and remove " from .php mappings.