Castle Windsor compile time error

So I downloaded and extracted the latest version of the Windsor IoC container today (2.5.2) and for some reason that is beyond me, keeps spitting out this horribly basic error when I try to compile:

The type or namespace name 'Castle' could not be found (are you missing a using directive or an assembly ref开发者_Python百科erence?)

Thing is - I HAVE referenced both the Castle.Core and Castle.Windsor assemblies (and various other combinations thereof) and still no luck. I'm guessing I must be doing something stupid but can't figure out what. This is for .NET 4.0.

Any ideas? Anyone? All constructive help appreciated

Are you using VS2010? If so, try to go project properties -> Application Tab and make sure that you are not using a Framework version that has "client profile" in it.