Stepping through code - can't get past strcat()

When I step through my code, as soon as I get to the strcat function, a box pops up and asks me for the location of STRCAT.ASM

I tried to change the folder to the Intel folder (in my C++ path) but it tells me the path cannot be changed...

What's this all about?

Oh, after I acknowledge the messagebox, the debugger crashes and kicks me back to the IDE (at least it doesn't crash C++ all together).

It could just be that you're stepping into the function instead of over the function in debug mode.

Yep, that was exactly it... I kept hitting the "Step Into" button.