Using the SVCS Menu with vss,what shall I do?

I do follow GS51.PDF(Page76 to Page78).
When I use SVCS Menu,I got the message as below:
"C:\Program Files\Microsoft Visual Studio\VSS\win32\Ss.exe" History "TRAFFIC.C" -I- -YAdmin
--- Error: can't execute '"C:\Program Files\Microsoft Visual Studio\VSS\win32\Ss.exe" History "TRAFFIC.C" -I- -YAdmin'