Not really, but I've pretty much steared clear of running PHP as a module on IIS, since a large number of people I have spoken to said that PHP continually crashed their servers when installed as a module. Do you have to have IIS? Why not try installing Apache (not version 2) instead? Its v stable on windows.
Or, if you are running the server as a testing one, it's pretty safe to have PHP running as a CGI. Thats what i have and it hasnt fallen over once 😃