Memory leaks

I have a couple of ideas that I need some help on:

1.) I have a program that has an obvious memory leak in it. Is there a debugging tool or method available that would allow me to see what resource in my program is responsible for the leak?

2.) I am using an active X control in another program that has a known memory leak. This is a program that runs 24/7. Is there a way to free up memory no longer being used by the program? Kind of like a cleanup or free memory call that would not require completely exiting the program.

I will appreciate any help regarding these matters.

Brian