Procmon is created by sysinternals and should be deployed to any server in your enterprise (and desktop) it allows you to see what file, registry, network and processed & thread activity is happening on your system.
I just used to to work out why VS 2010 was not installing, it turns out it iterates through all the drives on your system including your mapped drives. As I had just been playing with WebDav I had a mapped WebDav drive which was very slow to access. Looking at proc mon I could see straight away what the issue was and I disconnected the drive.
Problem sovled!