Can you enable the Intel NIC and do an IPCONFIG on that. I have a fealing that the auto config onit is assigning 192.168.0.2 which is why you can't use both at the same time.
Im not positive but I don't think Virtual PC allows unix/linux installs although it says it can. I tried it out for a while, but none of my linux installs would work. Get VMWare and you wont have any probs..
try the php installer from http://www.php.net/downloads.php I know it's the easy way out, but it will configure the php.ini and IIS for you, just sit back and enjoy (thats the theory anyway)