KDE3 screwed by the commercial QT 3.0.5

Hello SuSE folkz, After installing commercial version of Qt 3.0.5 into SuSE8.0 distro all KDE3 environment gets f***ed up. I can't understand what could go wrong. Should I have deinstalled free version of QT whitch came as a default installation alongside KDE3 or something else? Any KDE application starts and exits with error messages. Some applications won't even start. Could somebody please give me an idea what needs to be done to fix this disaster. Thank you in advance for any help or sources of information. Alex