Download the Memcached Win32 library here: http://code.jellycan.com/memcached. Just get the Win32 binary (direct link). Extract the downloaded archive file in a directory (e.g.
c:\memcached). There should be a
memcached.exe in there.
Run a command prompt as an administrator. Some info on how to do that here.
Install memcached as a service. Go to the memcached directory, type and run: