DELPHI 2 install in Windows 98

I have just installed Delphi 2 Developper on a Windows 98 PC. Everything's fine apart that the
component toolbar
buttons have their graphics unrecognisable. I have tryed different screen resolution but the problem
remains. It prevents
me from being able to find a component by its picture on the buttons.

Does anyone knows why I get such behavior or knows where I can ask ?

Thanks to email me.