If the following doesnÂ´t work:
1. Click on View -> Toolbars -> Deselect ICQ toolbar.
2. Click on Start -> Settings -> Control panel -> Add/Remove Programs -> Scroll to ICQ Toolbar -> Click delete. This option will permanently remove the toolbar from your system.
You may have to uninstall the browsers...both, but one at a time, or get Chrome and start again.
When you uninstall, you may be asked if you want to keep the settings...say "no". So, install Chrome, then uninstall Explorer, then uninstall FireFox...