@Bas: Just last night I was looking for Xperf to look at my DPC latency and after hunting around for a while I figured out I needed to get the Microsoft Windows SDK for Windows 7 and .NET Framework 3.5 SP1?

I just wanted a simple little tool. I haven't messed with it yet but I'm going to install it on a test system and see if there's some kind of custom install I can do.