Git (MSysGit) runs on Windows 7 and is free. There is a learning curve related to Git that, in my opinion, is worth your while (especially for distributed VCS), but some may disagree. These packages come with bashboth the client ssh(useful synchronization with remote repositories).
EDIT: For RCS, in particular, there is an RCS package via Cygwin or an independent package from the Purdue RCS main page (the latter says: "The latest PC (OS / 2 DOS Win95 NT), but I think it can work on Windows 7, I am sure that the Cygwin package works on Win 7).
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