Media Player 6.4 & the Missing Video

OS NT 4.0 Workstation

I have two systems running exact setups
of NT 4.0 and the Windows Media Player 6.4

One of them can see and hear an .asx file.
The other can only hear it.

Now outside of a missing codex (which one
I haven’t a clue) Icannot figure what
the problem is. Both are running Cable
for broadband and both players understand
that situation.

Oh and as usual MS wants 200 plus bucks
to fix the situation as I am using NT.
I hate to see what they are charging for XP!
Thanks