This has come up a few times recently so I thought I would highlight a post from Todd Carter about how to get the x86 ASP.NET performance counters when running on an x64 OS:

http://blogs.msdn.com/toddca/archive/2007/05/08/logging-32bit-asp-net-performance-counters-on-a-windows-2003-64bit-os.aspx

 

Just thought I would call that posting out since it has been helpful.