Windows 7 - Start menu

I hope its the right place to post it in

When i run a program or something, then it sticks or smthing into the start menu. And when i remove it, then theres just a white area.

heres a screenshot of it: http://www.upload.ee/image/530018/starmenu.png

That's the recent programs you've opened. You have a couple of choices in that area. You can either pin items to the start menu (they end up on top) and/or you can show recently opened items there. If you don't want to show any items there, you need to disable showing recently used items.

Right Click Taskbar > Properties > Start Menu Tab > Uncheck Store & Display Boxes

To pin an item to the start menu:
Right Click Shortcut/Item > Pin Item to Start Menu
OR
Drag to Start Button, Wait for Start Menu to pop up.

But how do i get rid of that white area?

You can customize the start menu, Start Menu - Customize. Try setting the number of programs to show to zero (or some small number)