You don't need a very powerful processor, or much memory, to run a server. Hell, I once got one running on an iBook G4 (1.2 GHz, 768 MB RAM), so no worries there.
Windows is not an *ideal* server platform. For one thing, compiling can be difficult unless your Cygwin/MinGW installation is set up ideally. Although you shouldn't have too much trouble just running a tremded.