Hey Phil;
Ahhh, thanks for the clarification. We have removed the perf counters, which we think will solve all of these issues. But until we can release the fix in Web PI, below should help you install IIS.
There are two places to find IIS components (which is why we started the Web PI project :) ).
1. Built-in IIS. You can go to Add/Remove programs. Then choose Turn on/off Windows Components. IIS will be one of those components. If you're installing on Windows XP or Windows 2k3, you will have a single option for IIS and then a few other components. If you're on Vista or Windows Server 2008, you will see that we have broken out the single IIS install into much smaller granularity to give you more control over what gets installed on your computer. For more information on installation options for IIS 7, please refer here: http://learn.iis.net/page.aspx/28/installing-iis-70-on-windows-vista/
2. IIS Extensions. In addition to the functionality found above, the IIS team has been busy shipping what we call extensions. These are fully supported features that were built after we shipped the operating system, but are scenarios that we thought were important for customers that we shipped them as soon as we could. You can find these modules here: http://www.iis.net/extensions. Since you're having the perf counter problem, I recommend choosing either the x86 or x64 link beneath the Web PI button and you will go directly to the download page for just that component. Note: most of these are for IIS 7 (Vista or Windows Server 2008) but there are a couple of features even for XP or Windows Server 2003 (such as FastCGI for PHP and Web Deploy to help with migration).
Thanks and let me know if you have any other questions,
Crystal