The crashes are usually generated by a bad plug-in, file, or a corrupted registry. However, to fix it, simply re-install the product. If during the uninstall, you have the option to Repair, use this function instead. It should re-install all the required registry entries and bring your browser to the default settings. In case of Internet Explorer, go to Control Panel > Internet Options > Advanced > Reset and Reset. There are two reset buttons. Push them both and follow the instructions.