Installation? Means where did you install MSTS? In the CD installer's default of C:\Program Files (x86)\Microsoft Games\Train Simulator or did you follow the Win 7 install process at the Stean4Me web sight as recommended in hundreds of posts on this forum and install it into C:\1MSTS? If you used the CD installer location. Start over and use the procedure at Steam4Me or you will continue to have problems.
"Does the Route and Consist Work for other Activities??" Mean:
Have you run other Activities on the Route? Have you used the Consist?
Now you say "Whenever I Try To Edit Traffic or Add A New Service For My Activity Through Traffic Editor in MSTS editor & tools... It (MSTS editor and tools) " At what exact point does the AE crash? When you click on the New button under Player Service? When the Service Editor opens? When you select a consist? Or when you click on the New button in the Service Editor window to create a new consist?
Have you tested all the ENGs, WAGs and consists in your Trainset with programs like ConBuilder and Convoi? And if so have you corrected all know errors? Critical errors in ENGs and WAGs will cause this sort of crash with no error message.