I had been searching for a single user CVS tool for personal usage from a long long time. Finally I seem to have got a just right kind of software for me.
Requirements : Single User CVS tool; For Windows; No client-server hassles; FREEWARE.
I met these in RCS Pro. I just installed it. Its easy to use though the usage is little different from the all powerful Clearcase that I use at work. There I checkout-edit-checkin, here I edit-checkin and checkout is required only if I have to undo the changes. Of course branching, graphical version tree are absent in RCS but that would be asking for too much for personal usage.
There is a good integration (menu item and differences) for Word,Excel etc!