Question: When I monitor my computer's memory usage in Resource Manager, I see that I constantly get between 60 and 100 hard faults.

Is this normal?

Or is that hard fault graph ideally supposed to be flat at 0?

I run Windows 7 and I have 4GB RAM.

Answer: 
I suppose that it can be normal considering the amount of RAM you have. 

The more RAM you have, the fewer hard faults you should see.
On my 2009 laptop with 3GB of RAM there are usually 0-20 hard faults per/sec while playing a game, processing a video, etc. It could be that certain kinds of RAM like ECC or certain brand qualities.