To keep the SSD for just Windows and RW is easy...just dont install anything else to it!. Most installers will give you an option of where to install the program to, so choose your alternative drive. It's considered wise to keep RW (and other programs) out of c:\program files or its (x86) sibling, as these folders get a certain degree of extra protection from Windows, which can cause write problems------it also means (as one example) you won't have to run RW_Tools as Administrator as the games out of the 'protected' place.
You'd be well advised to move your documents and
temporary files off the SSD and onto your old drive, have a read of http://www.sevenforums.com/tutorials/70 ... s-7-a.html