Ok here is the problem:When I play the TFTD - lower half of my screen is black!
How to make it show the whole thing - so I'll enjoy the game?

Not much info in all this... Did you try DOSBox?

Is windows edition:Yes

It's a Win edition of TFTD? And you ran it through dosbox? If so, have you tried without dosbox?

Um... yeah!

Ok, I was just eliminating possibilities :)

Let's take a wild shot... LCD screen, right?

Try using the solution posted here.

Ay progreams what can help me? I don't want to change my screen!

Read the thread I linked to, specifically this post. It tells you a different solution that does not require changing the monitor and is likely to work for you as well.

Where do I find his "Flat Panel Scaling Options"?