I've been using RCS (revision control system) from MKS Source Integrity for several old projects. I have to move to a new Windows 7 computer. The old version I have does not install on Windows 7, and a new version of the software is very expensive.
What is the best free or cheep source of RCS for Windows 7? Also, will it be compatible with MKS Toolkit which I am still going to install?
Git (MSysGit) works on Windows 7 and is free. There is a learning curve associated with Git, which I think is worth it (for the benefits you get, especially regarding a distributed VCS), but some may disagree. This bundles come with bash and an ssh client (useful synchronization with remote repositories).
EDIT: For RCS specifically, there is an RCS package via Cygwin or an independent package from the Purdue RCS Homepage (the latter says "The latest PC (OS/2 DOS Win95 NT)", but I guess it might work on Windows 7, I'm fairly sure the Cygwin package works on Win 7).